feat: rename package to dev.fiatcode.tracpulse and app to TracPulse

- Update Android package namespace and applicationId to dev.fiatcode.tracpulse
- Update AndroidManifest.xml package and app label to TracPulse
- Move all Kotlin source files to dev/fiatcode/tracpulse/ package
- Update pubspec.yaml name to tracpulse
- Update all Dart imports from package:traccar_client to relative
- Rename TraccarClientApp class to TracPulseApp
- Update user-facing strings in permission_screen to TracPulse
- Update notification channel label and wakeLock tag to TracPulse

android/app/build.gradle.kts

@@ -6,7 +6,7 @@ plugins {
 }
 
 android {
-    namespace = "com.traccar.traccar_client"
+    namespace = "dev.fiatcode.tracpulse"
     compileSdk = flutter.compileSdkVersion
     ndkVersion = flutter.ndkVersion
 
@@ -22,7 +22,7 @@ android {
 
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId = "com.traccar.traccar_client"
+        applicationId = "dev.fiatcode.tracpulse"
         // You can update the following values to match your application needs.
         // For more information, see: https://flutter.dev/to/review-gradle-config.
         minSdk = flutter.minSdkVersion