refactor(weather.app): move routes to weather.app module

weather/app/route/api.py

@@ -0,0 +1,13 @@
+import datetime
+
+from fastapi import FastAPI, Request
+
+from weather.model import WeatherResponse
+
+
+def mount(app: FastAPI):
+    @app.get("/api/weather/{location}/{date}")
+    async def get_weather_api(
+        request: Request, location: str, date: datetime.date
+    ) -> WeatherResponse:
+        return await request.app.state.weather_api.get_day(location, date)