diff --git a/backend/app/core/config.py b/backend/app/core/config.py
index 14337853..5a5edcc5 100644
--- a/backend/app/core/config.py
+++ b/backend/app/core/config.py
@@ -20,7 +20,14 @@ class Settings(BaseSettings):
     # and to build redirect URLs from auth routes in the overlay.
     FRONTEND_URL: str = "http://localhost:5173"
 
-    model_config = {"env_file": ".env", "env_file_encoding": "utf-8"}
+    # extra="ignore": tolerate legacy keys (DATA_DIR, SECRET_KEY, DATABASE_URL, …)
+    # left over from pre-split .env files or from the velxio-prod overlay so the
+    # OSS image starts cleanly instead of crashing with extra_forbidden.
+    model_config = {
+        "env_file": ".env",
+        "env_file_encoding": "utf-8",
+        "extra": "ignore",
+    }
 
 
 settings = Settings()
diff --git a/frontend/public/components-metadata.json b/frontend/public/components-metadata.json
index b58b52d5..2af5c428 100644
--- a/frontend/public/components-metadata.json
+++ b/frontend/public/components-metadata.json
@@ -518,7 +518,7 @@
       "description": "Single-channel optocoupler. CTR 80–600% (typ. 100%). Higher drive than 4N25, commonly used for MCU-to-mains isolation."
     },
     {
-      "thumbnail": "<svg width=\"64\" height=\"64\" xmlns=\"http://www.w3.org/2000/svg\">\n      <rect width=\"64\" height=\"64\" fill=\"#1a2332\" rx=\"4\"/>\n      <rect x=\"10\" y=\"14\" width=\"44\" height=\"30\" fill=\"#2a3548\" rx=\"3\" stroke=\"#4a5878\"/>\n      <text x=\"32\" y=\"30\" text-anchor=\"middle\" font-size=\"9\" font-family=\"monospace\" fill=\"#4ade80\" font-weight=\"bold\">5.00V</text>\n      <text x=\"32\" y=\"40\" text-anchor=\"middle\" font-size=\"7\" font-family=\"monospace\" fill=\"#fbbf24\">1.00A</text>\n      <circle cx=\"18\" cy=\"52\" r=\"3\" fill=\"#dc2626\"/>\n      <circle cx=\"46\" cy=\"52\" r=\"3\" fill=\"#0f172a\" stroke=\"#64748b\"/>\n      <text x=\"32\" y=\"60\" text-anchor=\"middle\" font-size=\"6\" fill=\"#9d9d9d\">PSU</text>\n    </svg>",
+      "thumbnail": "<svg width=\"64\" height=\"64\" xmlns=\"http://www.w3.org/2000/svg\">\n      <rect width=\"64\" height=\"64\" fill=\"#e0e0e0\" rx=\"4\"/>\n      <text x=\"50%\" y=\"50%\" text-anchor=\"middle\" dy=\".3em\" font-size=\"10\" fill=\"#666\">\n        POWER-SUPPLY\n      </text>\n    </svg>",
       "tags": [
         "power-supply",
         "regulated",
diff --git a/frontend/public/sitemap.xml b/frontend/public/sitemap.xml
index 3481e01d..698cc6af 100644
--- a/frontend/public/sitemap.xml
+++ b/frontend/public/sitemap.xml
@@ -4,986 +4,986 @@
 
   <url>
     <loc>https://velxio.dev/</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>weekly</changefreq>
     <priority>1</priority>
   </url>
   <url>
     <loc>https://velxio.dev/editor</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>weekly</changefreq>
     <priority>0.9</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>weekly</changefreq>
     <priority>0.8</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.8</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/intro</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.8</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/getting-started</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.8</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/emulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.7</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/esp32-emulation</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.7</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/riscv-emulation</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.7</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/rp2040-emulation</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.7</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/raspberry-pi3-emulation</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.7</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/components</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.7</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/architecture</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.7</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/third-party</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.7</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/mcp</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.7</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/setup</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/docs/roadmap</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/circuit-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>weekly</changefreq>
     <priority>0.95</priority>
   </url>
   <url>
     <loc>https://velxio.dev/spice-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>weekly</changefreq>
     <priority>0.9</priority>
   </url>
   <url>
     <loc>https://velxio.dev/electronics-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.85</priority>
   </url>
   <url>
     <loc>https://velxio.dev/custom-chip-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.85</priority>
   </url>
   <url>
     <loc>https://velxio.dev/attiny85-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.85</priority>
   </url>
   <url>
     <loc>https://velxio.dev/arduino-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.9</priority>
   </url>
   <url>
     <loc>https://velxio.dev/arduino-emulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.9</priority>
   </url>
   <url>
     <loc>https://velxio.dev/atmega328p-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.85</priority>
   </url>
   <url>
     <loc>https://velxio.dev/arduino-mega-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.85</priority>
   </url>
   <url>
     <loc>https://velxio.dev/esp32-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.9</priority>
   </url>
   <url>
     <loc>https://velxio.dev/esp32-s3-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.85</priority>
   </url>
   <url>
     <loc>https://velxio.dev/esp32-c3-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.85</priority>
   </url>
   <url>
     <loc>https://velxio.dev/raspberry-pi-pico-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.9</priority>
   </url>
   <url>
     <loc>https://velxio.dev/raspberry-pi-simulator</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.85</priority>
   </url>
   <url>
     <loc>https://velxio.dev/v2</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.9</priority>
   </url>
   <url>
     <loc>https://velxio.dev/v2-5</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>weekly</changefreq>
     <priority>0.95</priority>
   </url>
   <url>
     <loc>https://velxio.dev/about</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.7</priority>
   </url>
 
   <url>
     <loc>https://velxio.dev/examples/blink-led</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/traffic-light</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/button-led</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/fade-led</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/serial-hello</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/rgb-led</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/simon-says</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/pico-doom-raycaster</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/tft-display</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/lcd-hello</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/serial-echo</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/serial-led-control</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/i2c-scanner</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/i2c-rtc-read</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/i2c-eeprom-rw</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/spi-loopback</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/multi-protocol</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/pico-blink</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/pico-serial-echo</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/pico-serial-led-control</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/pico-i2c-scanner</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/pico-i2c-rtc-read</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/pico-i2c-eeprom-rw</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/pico-spi-loopback</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/pico-adc-read</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/pico-multi-protocol</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/esp32-blink-led</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/esp32-serial-echo</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/pi-to-arduino-led-control</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/dual-pico-serial1-passthrough</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/dual-pico-bidirectional-handshake</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/dual-pico-digital-mirror</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/nano-blink</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/nano-serial</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/nano-button-led</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/nano-fade</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/mega-blink</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/mega-serial</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/mega-led-chase</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/mega-serial-control</loc>
-    <lastmod>2026-05-16</lastmod>
+    <lastmod>2026-05-18</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.6</priority>
   </url>
   <url>
     <loc>https://velxio.dev/examples/c3-blink</loc>
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