fix(analytics): read BAIDU_TONGJI_ID per-request instead of at import time

The Jinja2 global was set once at module import time via
templates.env.globals, which captured an empty string if the
env var wasn't available during import. Changed to pass
baidu_tongji_id through template context at request time,
matching how the /api/config/analytics endpoint works.

Author: calderbuild

api/routers/seo_pages.py

@@ -17,10 +17,14 @@
 
 router = APIRouter()
 templates = Jinja2Templates(directory="templates")
-templates.env.globals["baidu_tongji_id"] = os.getenv("BAIDU_TONGJI_ID", "")
 limiter = Limiter(key_func=get_remote_address)
 
 
+def _common_context() -> dict:
+    """每次请求时动态读取的公共模板变量."""
+    return {"baidu_tongji_id": os.getenv("BAIDU_TONGJI_ID", "")}
+
+
 @lru_cache(maxsize=128)
 def load_cities() -> List[Dict]:
     """加载城市数据, 如不存在则创建默认值."""
@@ -94,6 +98,7 @@ async def homepage(request: Request):
             "schema_jsonld": schema_list,
             "breadcrumbs": [],
             "cities": load_cities(),
+            **_common_context(),
         },
     )
 
@@ -145,6 +150,7 @@ async def city_page(request: Request, city_slug: str):
             ],
             "city": city,
             "city_content": city_content,
+            **_common_context(),
         },
     )
 
@@ -178,6 +184,7 @@ async def about_page(request: Request):
                 {"name": "首页", "url": "/"},
                 {"name": "关于我们", "url": "/about"},
             ],
+            **_common_context(),
         },
     )
 
@@ -245,6 +252,7 @@ async def how_it_works(request: Request):
                 {"name": "首页", "url": "/"},
                 {"name": "使用指南", "url": "/how-it-works"},
             ],
+            **_common_context(),
         },
     )
 
@@ -331,6 +339,7 @@ async def faq_page(request: Request):
                 {"name": "常见问题", "url": "/faq"},
             ],
             "faqs": faqs,
+            **_common_context(),
         },
     )