refactor: use shared met-weather library for home-screen MET weather (v0.3.7)

- Replace internal MetApiService/MetForecastResponse + Retrofit MET fetch in
  AppHelper with dk.haugesenspil:met-weather (Gitea maven).
- fetchMetWeather now delegates to MetWeatherClient; 15-min cache kept.
- Drop MetApiService.kt and MetForecastResponse.kt.
release build v0.3.7

settings.gradle.kts

@@ -14,6 +14,7 @@ dependencyResolutionManagement {
         google()
         mavenCentral()
         maven(url = "https://jitpack.io")
+        maven(url = "https://gitea.haugesenspil.dk/api/packages/jonas/maven")
     }
 }