feat: Enhance TV support and Daily Weather Forecast (w/ Air Quality)

- **Frontend (Flutter)**
    - Optimize for Google TV: Force Landscape mode, disable touchscreen requirement, and set TV Dashboard as default home.
    - Weather Widget:
        - Add Daily Max/Min temperature ('최고/최저').
        - Add Air Quality Index (AQI) with visual indicator ('미세먼지').
        - Increase font sizes and adjust layout to match Digital Clock style.
        - Implement 1-hour auto-refresh timer.
    - Model: Update WeatherInfo to support tempMin, tempMax, and aqi.

- **Backend (Node.js)**
    - Weather API (/api/weather):
        - Implement daily forecast aggregation logic (Seoul Time KST) to calculate accurate daily High/Low.
        - Integrate OpenWeatherMap Air Pollution API to fetch AQI.

flutter_app/android/app/src/main/AndroidManifest.xml

@@ -3,6 +3,9 @@
     <uses-feature
         android:name="android.software.leanback"
         android:required="false" />
+    <uses-feature
+        android:name="android.hardware.touchscreen"
+        android:required="false" />
     <application
         android:label="google_tv_dashboard"
         android:name="${applicationName}"
@@ -16,6 +19,7 @@
             android:theme="@style/LaunchTheme"
             android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:hardwareAccelerated="true"
+            android:screenOrientation="landscape"
             android:windowSoftInputMode="adjustResize">
             <!-- Specifies an Android theme to apply to this Activity as soon as
                  the Android process has started. This theme is visible to the user