fix: mount /uploads directory for serving media files

The media library stores uploaded files in the uploads/ directory
but this wasn't being served by FastAPI. Added StaticFiles mount
for /uploads path to serve user-uploaded media files.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

main.py

@@ -146,6 +146,17 @@ if STATIC_DIR.exists():
     logger.info(f"Mounted static files from: {STATIC_DIR}")
 else:
     logger.warning(f"Static directory not found at {STATIC_DIR}")
+
+# Mount uploads directory for user-uploaded media files
+UPLOADS_DIR = BASE_DIR / "uploads"
+if UPLOADS_DIR.exists():
+    app.mount("/uploads", StaticFiles(directory=str(UPLOADS_DIR)), name="uploads")
+    logger.info(f"Mounted uploads from: {UPLOADS_DIR}")
+else:
+    # Create uploads directory if it doesn't exist
+    UPLOADS_DIR.mkdir(parents=True, exist_ok=True)
+    app.mount("/uploads", StaticFiles(directory=str(UPLOADS_DIR)), name="uploads")
+    logger.info(f"Created and mounted uploads directory: {UPLOADS_DIR}")
 # ========================================
 
 # Include API router (JSON endpoints at /api/*)