fix: update application namespace and clean up deprecated files

- Changed application namespace from `de.tt_tagebuch.app` to `de.tsschulz.tt_tagebuch` in build.gradle.kts and AndroidManifest.xml for consistency.
- Updated DEVELOPMENT.md to reflect the correct package name for the app.
- Removed deprecated files related to AppDependencies, MainActivity, MainApplication, and PDF generation, streamlining the codebase.
- Enhanced TODO.md to reflect the current status of the Android team planning phase implementation.

mobile-app/scripts/install-debug-emulator.sh

@@ -3,7 +3,7 @@
 # Nutzung: von mobile-app/ aus: ./scripts/install-debug-emulator.sh
 set -euo pipefail
 cd "$(dirname "$0")/.."
-adb uninstall de.tt_tagebuch.app 2>/dev/null || true
+adb uninstall de.tsschulz.tt_tagebuch 2>/dev/null || true
 ./gradlew :composeApp:clean :composeApp:installDebug \
   -PbackendBaseUrl=http://10.0.2.2:3005 \
   --no-configuration-cache