feat(content-editor): tambah editor konten guru dengan draft & publish
Backend:
- Model ContentDraft + migration 0004_content_drafts
- CRUD draft: save, reload, preview, publish, discard
- Tree ops: create file/folder, rename, delete dengan draft cleanup
- Refactor _render_markdown_string() agar bisa render dari buffer
- Refactor teacher_auth ke modul shared (teacher_auth.py)
- Blueprint routes/content_editor.py (17 endpoint)
- Permission error handling di semua write operations
- Tambah Pillow ke requirements.txt
- Mount content/ & assets/ dari :ro ke :rw
Frontend:
- Page /teacher/content dengan panel tree + editor + preview
- ContentFileTree, LessonContentView, QuizPreviewReadonly components
- contentEditor.ts service layer & contentEditor.svelte.ts state manager
- CodeEditor support @codemirror/lang-markdown + sync code prop
- Tambah @codemirror/lang-markdown dependency
a2nr
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