Initial commit: clean project structure

- Backend: FastAPI + SQLAlchemy + Celery (Python 3.11+)
- Frontend: Vue 3 + TypeScript + Pinia + Tailwind
- Admin Frontend: separate Vue 3 app for management
- Docker Compose: 9 services orchestration
- Specs: design prototypes, memory system PRD, product roadmap

Cleanup performed:
- Removed temporary debug scripts from backend root
- Removed deprecated admin_app.py (embedded UI)
- Removed duplicate docs from admin-frontend
- Updated .gitignore for Vite cache and egg-info

backend/scripts/manual_init_db.py

@@ -0,0 +1,21 @@
+import asyncio
+import sys
+import os
+
+# Add backend to path
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from app.db.database import init_db
+from app.core.logging import setup_logging
+
+async def main():
+    setup_logging()
+    print("Initializing database...")
+    try:
+        await init_db()
+        print("Database initialized successfully.")
+    except Exception as e:
+        print(f"Error initializing database: {e}")
+
+if __name__ == "__main__":
+    asyncio.run(main())