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/gradle.properties

@@ -5,17 +5,18 @@ org.gradle.workers.max=2
 LOCAL_API_BASE_URL=https://harheimertc.tsschulz.de/
 
 # Production backend for Play Store build variant
-PRODUCTION_API_BASE_URL=https://harheimertc.de/
+PRODUCTION_API_BASE_URL=https://harheimertc.tsschulz.de/
 
 # Android app versioning for Play Store uploads
-ANDROID_VERSION_CODE=7
-ANDROID_VERSION_NAME=0.9.2
+ANDROID_VERSION_CODE=17
+ANDROID_VERSION_NAME=0.9.12
 
-# Enable R8 for release by default so mapping.txt is generated for Play Console.
-RELEASE_MINIFY_ENABLED=true
+# Temporary hotfix: disable R8 minification for release to avoid Retrofit generic signature stripping.
+RELEASE_MINIFY_ENABLED=false
 
 # Release signing (set in local, untracked gradle.properties or via CI secrets)
-# RELEASE_STORE_FILE=/absolute/path/to/keystore.jks
+RELEASE_STORE_FILE=/home/torsten/android\ keystore/harheimertc.jks
+# Keep secrets out of git. Use ~/.gradle/gradle.properties or environment variables.
 # RELEASE_STORE_PASSWORD=***
 # RELEASE_KEY_ALIAS=***
 # RELEASE_KEY_PASSWORD=***