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/test_host_routing.py

@@ -11,6 +11,8 @@ import shutil
 import pytest
 from starlette.websockets import WebSocketDisconnect
 
+from app.main import app
+from app.platform.host_middleware import TenantHostMiddleware
 from tests.conftest import (
     AUTO_HOST,
     JIANCAI_HOST,
@@ -22,10 +24,20 @@ from tests.conftest import (
 NOPE_HOST = "nope.example.com"
 
 
+# ---- 中间件挂载顺序守护 -------------------------------------------------------
+
+
+def test_tenant_middleware_is_outermost_user_middleware():
+    # add_middleware 后加者居 user_middleware[0] = 最外层。租户解析必须
+    # 先于一切用户中间件(里层中间件/路由才读得到 state.tenant)——未来
+    # 新中间件若更晚 add_middleware 插到租户中间件外层,此测试即红。
+    assert app.user_middleware[0].cls is TenantHostMiddleware
+
+
 # ---- 平台级豁免 -------------------------------------------------------------
 
 
-def test_known_host_serves_health(app_client):
+def test_health_served_for_any_host(app_client):
     # /health 在任何 Host 下可达(部署健康检查 curl 127.0.0.1:8018,
     # Host 是 IP:端口,对 registry 必然未知)
     assert app_client.get("/health").status_code == 200