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/add_config_column.py

@@ -0,0 +1,27 @@
+import asyncio
+import os
+import sys
+
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from app.db.database import async_engine
+from sqlalchemy import text
+
+async def upgrade_db():
+    print("🚀 Checking database schema...")
+    async with async_engine.begin() as conn:
+        # Check if column exists
+        result = await conn.execute(text(
+            "SELECT column_name FROM information_schema.columns WHERE table_name='providers' AND column_name='config_json';"
+        ))
+        if result.scalar():
+            print("✅ Column 'config_json' already exists.")
+        else:
+            print("⚠️ Column 'config_json' missing. Adding it now...")
+            await conn.execute(text("ALTER TABLE providers ADD COLUMN config_json JSON;"))
+            print("✅ Column 'config_json' added successfully.")
+
+if __name__ == "__main__":
+    if sys.platform == 'win32':
+        asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
+    asyncio.run(upgrade_db())