refactor: 统一 Redis 连接管理，改用 RedisService

- App 启动时初始化 RedisService，关闭时释放连接
- Celery worker 通过 worker_process_init 钩子初始化 Redis
- Agent 端点改用 RedisService 替代直接创建连接
- Celery task 改为 async def，使用统一连接
- 删除无用的 infra 模块和 core/http/models
- 日志脱敏，不记录 Redis 密码
- 初始化失败时 fail-fast
- 异常发布添加二级保护

backend/tests/e2e/test_mobile_health_e2e.py

@@ -46,7 +46,7 @@ def test_mobile_health_e2e() -> None:
                 base_url=f"http://{host}:{port}"
             )
             try:
-                response = request_context.get("/api/v1/health")
+                response = request_context.get("/health")
                 assert response.status == 200
                 body = response.json()
                 assert body["status"] == "ok"

backend/tests/integration/test_mobile_app_skeleton.py

@@ -15,16 +15,6 @@ def test_app_health_returns_envelope() -> None:
     assert body["status"] == "ok"
 
 
-def test_mobile_router_health_returns_envelope() -> None:
-    client = TestClient(app)
-
-    response = client.get("/api/v1/health")
-
-    assert response.status_code == 200
-    body = response.json()
-    assert body["status"] == "ok"
-
-
 def test_not_found_returns_error_envelope() -> None:
     client = TestClient(app)
 

backend/tests/unit/core/agent/test_queue_tasks.py

@@ -15,15 +15,16 @@ class _FakeResumeService:
         return {"session_id": session_id, "tool_call_id": tool_call_id}
 
 
-def test_run_agent_task_emits_started_runtime_and_finished_events() -> None:
+@pytest.mark.asyncio
+async def test_run_agent_task_emits_started_runtime_and_finished_events() -> None:
     session_id = "00000000-0000-0000-0000-000000000001"
     events: list[str] = []
 
-    def _publish(event_type: str, payload: dict[str, object]) -> None:
+    async def _publish(event_type: str, payload: dict[str, object]) -> None:
         del payload
         events.append(event_type)
 
-    result = run_agent_task(
+    result = await run_agent_task(
         {
             "command": "run",
             "session_id": session_id,
@@ -38,7 +39,8 @@ def test_run_agent_task_emits_started_runtime_and_finished_events() -> None:
     assert events == ["RUN_STARTED", "RUNTIME_EVENT", "RUN_FINISHED"]
 
 
-def test_run_agent_task_emits_error_event_on_exception() -> None:
+@pytest.mark.asyncio
+async def test_run_agent_task_emits_error_event_on_exception() -> None:
     session_id = "00000000-0000-0000-0000-000000000001"
 
     class _BrokenRunService(_FakeRunService):
@@ -48,12 +50,12 @@ def test_run_agent_task_emits_error_event_on_exception() -> None:
 
     events: list[str] = []
 
-    def _publish(event_type: str, payload: dict[str, object]) -> None:
+    async def _publish(event_type: str, payload: dict[str, object]) -> None:
         del payload
         events.append(event_type)
 
     with pytest.raises(RuntimeError):
-        run_agent_task(
+        await run_agent_task(
             {
                 "command": "run",
                 "session_id": session_id,