feat(teacher): manajemen akun guru canonical + first-run otomatis; cabut backend CSV (PG only)
- feat: ./elemes.sh teacher — upsert satu akun guru canonical (prompt nama default TEACHER_NAME, token tersembunyi via stdin, rotasi token saat guru sudah ada, idempotent); TEACHER_NAME/TEACHER_TOKEN di .env
- feat: first-run otomatis — db_init jalankan alembic upgrade head + bootstrap guru bila TEACHER_TOKEN terisi (run/runbuild/runclearbuild)
- refactor: backend CSV dicabut penuh — hapus mount tokens_siswa.csv, TOKENS_FILE, STORAGE_BACKEND=csv, csv_backend.py, csv_importer.py, generate_tokens.py, script migrate/verify/export CSV, command generatetoken/dbimport/dbverify/dbexport/synclessons; storage fail-loud postgresql-only
- fix: dbrestore gagal diam-diam saat restore ke DB berisi data (dump tanpa --clean) — dbbackup kini --clean --if-exists + dbrestore reset schema public; roundtrip terverifikasi
- test: suite kontrak PG-native + route auth/progress integrasi PG; 183 passed container, 96 passed host, frontend 91 passed
- docs: README, documentation.md, docs/01/02/11, load-test/README disinkronkan ke realita PostgreSQL-only; proposal.md dipertahankan (historis)
- chore: load-test token sintetis di-seed ke PG (content_parser), config.py bersih TOKENS_FILE, .dockerignore/.gitignore dibersihkan
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