Refactor application structure and configuration

- Updated the application namespace and ID from "net.ypchat.app" to "de.ypchat.android" for better alignment with branding.
- Increased Gradle heap size settings to optimize build performance.
- Disabled dependency constraints to simplify dependency management.
- Removed obsolete files related to the previous application structure, including MainActivity, YpChatApp, and various core components, streamlining the codebase.

These changes collectively enhance the application's configuration and structure, improving maintainability and performance.

android/app/build.gradle.kts

@@ -27,11 +27,11 @@ val appBaseUrl = localProperties.getProperty("ypchat.baseUrl", defaultBaseUrl)
 val hasReleaseSigning = releaseStoreFile?.exists() == true
 
 android {
-    namespace = "net.ypchat.app"
+    namespace = "de.ypchat.android"
     compileSdk = 36
 
     defaultConfig {
-        applicationId = "net.ypchat.app"
+        applicationId = "de.ypchat.android"
         minSdk = 26
         targetSdk = 36
         versionCode = 1