feat: add QTTR values feature to member area

- Implemented QTTR values screen in the member area with data fetching and display.
- Added new API endpoint for QTTR values retrieval.
- Created a new view model for managing QTTR data state.
- Updated navigation to include QTTR section.
- Enhanced error handling and loading states for QTTR data.
- Adjusted server-side logic to import QTTR values from external source.
- Updated Android app version and adjusted build configurations.
- Added necessary UI components and styling for QTTR display.

android-app/app/proguard-rules.pro

@@ -10,6 +10,15 @@
 	@retrofit2.http.* <methods>;
 }
 
+# Retrofit + R8 full mode: keep interfaces with HTTP methods and suspend continuation generics.
+-if interface * { @retrofit2.http.* <methods>; }
+-keep,allowobfuscation interface <1>
+-keep,allowobfuscation,allowshrinking class kotlin.coroutines.Continuation
+
+# Avoid Retrofit generic signature loss on release builds for our API interface.
+-keep interface de.harheimertc.data.ApiService { *; }
+-keepclassmembers interface de.harheimertc.data.ApiService { *; }
+
 # Keep app DTO/request/response models used via Moshi reflection.
 -keep class de.harheimertc.data.*Dto { *; }
 -keep class de.harheimertc.data.*Request { *; }
@@ -19,3 +28,10 @@
 -keepclassmembers class * {
 	@com.squareup.moshi.Json <fields>;
 }
+
+# Keep WorkManager + Room generated classes used reflectively at startup.
+-keep class * extends androidx.work.ListenableWorker {
+	<init>(android.content.Context, androidx.work.WorkerParameters);
+}
+-keep class androidx.work.impl.WorkDatabase_Impl { *; }
+-keep class * extends androidx.room.RoomDatabase { *; }