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/lib/main.dart

@@ -22,6 +22,10 @@ Future<void> main() async {
   WidgetsFlutterBinding.ensureInitialized();
   // Hide status bar for TV immersive experience
   SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersiveSticky);
+  await SystemChrome.setPreferredOrientations([
+    DeviceOrientation.landscapeLeft,
+    DeviceOrientation.landscapeRight,
+  ]);
   GoogleFonts.config.allowRuntimeFetching = false;
 
   await initializeDateFormatting();
@@ -136,19 +140,7 @@ class AdaptiveHome extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    const forceTv = String.fromEnvironment('FORCE_TV', defaultValue: 'false');
-    if (forceTv.toLowerCase() == 'true') {
-      return const TvDashboardScreen();
-    }
-
-    final size = MediaQuery.of(context).size;
-    final shortestSide = size.shortestSide;
-    final isMobile = shortestSide < 600;
-
-    if (isMobile) {
-      return const MobileHomeScreen();
-    }
-
+    // Forcing TV Dashboard for Google TV deployment
     return const TvDashboardScreen();
   }
 }