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/app/tasks/memory.py

@@ -0,0 +1,29 @@
+
+import asyncio
+
+from app.core.celery_app import celery_app
+from app.core.logging import get_logger
+from app.db.database import _get_session_factory
+from app.services.memory_service import prune_expired_memories
+
+logger = get_logger(__name__)
+
+@celery_app.task
+def prune_memories_task():
+    """Daily task to prune expired memories."""
+    logger.info("prune_memories_task_started")
+
+    async def _run():
+        # Ensure engine is initialized in this process
+        session_factory = _get_session_factory()
+        async with session_factory() as session:
+             return await prune_expired_memories(session)
+
+    try:
+        # Create a new event loop for this task execution
+        count = asyncio.run(_run())
+        logger.info("prune_memories_task_completed", deleted_count=count)
+        return f"Deleted {count} expired memories"
+    except Exception as exc:
+        logger.error("prune_memories_task_failed", error=str(exc))
+        raise