P0-1: 删除 docker-compose-override.yml + deploy-server 两份 workers=2→1（预防性修复，服务器根 compose 已是 workers=1）

test_neo4j_conn.py

@@ -0,0 +1,18 @@
+import asyncio
+import sys
+sys.path.insert(0, '/app')
+
+async def test():
+    from app.services.neo4j_client import get_neo4j_client
+    client = await get_neo4j_client()
+    print(f'Neo4j client: {client}')
+    if client:
+        try:
+            healthy = await client.health_check()
+            print(f'Health check: {healthy}')
+        except Exception as e:
+            print(f'Health check error: {e}')
+    else:
+        print('Neo4j client is None - connection failed')
+
+asyncio.run(test())