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.

scripts/generate-mobile-i18n.js

@@ -168,7 +168,7 @@ function main() {
     .sort((a, b) => a.localeCompare(b));
 
   const lines = [];
-  lines.push('package de.tt_tagebuch.shared.i18n');
+  lines.push('package de.tsschulz.tt_tagebuch.shared.i18n');
   lines.push('');
   lines.push('data class SupportedLanguage(val code: String, val label: String)');
   lines.push('');