fix: Host中间件审查修复（本地开发文档/顺序守护测试/ws断连分支/夹具清理）

Co-Authored-By: Claude Code <noreply@anthropic.com>

tests/conftest.py

@@ -10,6 +10,7 @@ import pytest
 from fastapi.testclient import TestClient
 from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
 from sqlalchemy.pool import NullPool
+from urllib.parse import urlsplit
 
 from app.engine.models import Base
 
@@ -152,7 +153,7 @@ def app_test_client(app_instance, base_url, cleanup_root):
     try:
         with TenantTestClient(
                 app_instance, base_url=base_url,
-                ws_default_host=base_url.removeprefix("http://")) as c:
+                ws_default_host=urlsplit(base_url).netloc) as c:
             yield c
     finally:
         app_instance.state.registry = None
@@ -171,8 +172,8 @@ def app_client(tmp_path):
       TestClient——同一 app 上两个 client 各跑一次 lifespan 会共享
       registry 而 engine 各绑一个循环,跨循环死锁。
     """
-    build_app(SEED_DIR, tmp_path)
-    with app_test_client(app, f"http://{JIANCAI_HOST}", tmp_path) as c:
+    a = build_app(SEED_DIR, tmp_path)
+    with app_test_client(a, f"http://{JIANCAI_HOST}", tmp_path) as c:
         yield c