feat: implement proxy management endpoints and MongoDB integration

app/core/mongodb.py

@@ -13,6 +13,18 @@ class _MongoDB:
 
 mongodb = _MongoDB()
 
+
+async def init_mongodb() -> None:
+    mongodb.client = AsyncIOMotorClient(settings.MONGODB_URI)
+    await ensure_mongodb_available()
+
+
+async def close_mongodb() -> None:
+    client = mongodb.client
+    mongodb.client = None
+    if client is not None:
+        client.close()
+
 async def get_database() -> AsyncIOMotorDatabase:
     return mongodb.get_database()