feat: 今天环境条新增下一个倒数日、浙江油价、上证指数、降雨/AQI

- 后端新增三源：中石化浙江油价(3步会话)、新浪上证行情、Open-Meteo 空气质量(国标AQI换算)，按源独立超时与状态
- 天气行改为 降雨概率% · AQI 等级（无雨无AQI时保留观测时间），stale 补缓存标记
- 前端 strip 六格两行(桌面)/四行(移动)，倒数日取本地缓存最近一条，超12字截断
- 修复两处 AppSheet 动画竞态存量 e2e 失败(modal contract footer 时序、scrollable 重开残留 dialog)

backend/main.py

@@ -74,6 +74,7 @@ from .schemas import (
     UserUpdate,
 )
 from .today_environment import get_environment as get_today_environment
+from .today_environment import get_environment_extras as get_today_environment_extras
 
 
 @asynccontextmanager
@@ -216,7 +217,14 @@ async def me(user: User = Depends(current_user)):
 
 @app.get("/api/v1/today/environment")
 async def today_environment(_: User = Depends(current_user)):
-    return await get_today_environment()
+    environment, extras = await asyncio.gather(
+        get_today_environment(), get_today_environment_extras()
+    )
+    return {
+        **{key: value for key, value in environment.items() if key != "errors"},
+        **{key: value for key, value in extras.items() if key != "errors"},
+        "errors": {**environment.get("errors", {}), **extras.get("errors", {})},
+    }
 
 
 @app.patch("/api/v1/me", response_model=UserOut)