chore: 更新Docker配置，优化路由

- 更新docker-compose.yml
- 优化conversations.py、plans.py、quota.py、user.py、websocket.py

Co-authored-by: Cursor <cursoragent@cursor.com>

api/docker-compose.yml

@@ -85,6 +85,8 @@ services:
         max-file: "3"
 
   # Celery Worker（后台任务处理）
+  # 注意：与 api 共用镜像，但 Dockerfile 的 HEALTHCHECK 是探测 8000 端口的，worker 不提供 HTTP，
+  # 因此必须在此覆盖健康检查，否则容器会一直被判定为 unhealthy
   celery-worker:
     build:
       context: .
@@ -105,6 +107,12 @@ services:
         condition: service_healthy
       api:
         condition: service_healthy
+    healthcheck:
+      test: ["CMD", "celery", "-A", "tasks.celery_app", "inspect", "ping"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
     networks:
       - life-echo-network
     logging: