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/fix_db_schema.py

@@ -0,0 +1,29 @@
+import asyncio
+import os
+import sys
+
+# Add backend to path
+sys.path.append(os.path.join(os.getcwd()))
+
+from sqlalchemy import text
+from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker, AsyncSession
+from app.core.config import settings
+
+async def add_column():
+    engine = create_async_engine(settings.database_url)
+    async_session = async_sessionmaker(engine, expire_on_commit=False)
+    async with async_session() as session:
+        try:
+            print("Adding config_json column to providers table...")
+            await session.execute(text("ALTER TABLE providers ADD COLUMN IF NOT EXISTS config_json JSONB DEFAULT '{}'::jsonb"))
+            await session.commit()
+            print("Successfully added config_json column.")
+        except Exception as e:
+            print(f"Error adding column: {e}")
+            await session.rollback()
+
+if __name__ == "__main__":
+    import asyncio
+    if sys.platform == "win32":
+        asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
+    asyncio.run(add_column())