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/DEVELOPMENT.md

@@ -63,7 +63,7 @@ Testest du mit der **LAN-IP deines PCs** (echtes Gerät), musst du diese IP dort
 2. **Alte Installation / Build-Cache:** Emulator-App deinstallieren, Clean, neu installieren:
    ```bash
    cd mobile-app
-   adb uninstall de.tt_tagebuch.app
+   adb uninstall de.tsschulz.tt_tagebuch
    ./gradlew :composeApp:clean :composeApp:installDebug --no-configuration-cache
    ```
    Oder das Skript: `./scripts/install-debug-emulator.sh`