Markdown viewer with mermaid diagrams and syntax highlighting.
POST /api/files
body: {"content": "# hello", "title": "greeting"}
→ {"id": "...", "url": "/f/..."}
POST /api/files (multipart)
file=@notes.md
→ {"id": "...", "url": "..."}
GET /f/{id} — render
GET /api/files/{id} — raw
Currently storing 5 file(s).