feat(android): add API client, tRPC bridge, and offline support

- Add Retrofit with kotlinx-serialization converter for tRPC endpoints
- Create TRPCApiService with type-safe wrappers for all procedures
- Implement AuthInterceptor for JWT injection from EncryptedSharedPreferences
- Add ErrorHandler with exponential backoff retry logic and ApiResult sealed class
- Create 11 serializable data models matching backend enums
- Add JSON file-based cache with TTL invalidation (CacheManager)
- Implement repositories: User, DarkWatch, VoicePrint, Alert, Subscription
- Add offline sync: PendingRequestQueue, OfflineWorker, SyncManager
- Create manual DI modules: NetworkModule, DatabaseModule, RepositoryModule
- Add WorkManager for background offline request processing
- Add ConnectivityManager-based network monitoring for auto-sync
- Configure build system with KSP for Room, kotlinx-serialization plugin
- Update build config with environment-specific API URLs
- Write 19 new unit tests for ErrorHandler, CacheManager, TRPCResponse, SyncManager

android/ShieldAI/gradle.properties

@@ -1,15 +1,2 @@
-# Project-wide Gradle settings.
-# IDE (e.g. Android Studio) users:
-# Gradle settings configured through the IDE *will override*
-# any settings specified in this file.
-# For more details on how to configure your build environment visit
-# http://www.gradle.org/docs/current/userguide/build_environment.html
-# Specifies the JVM arguments used for the daemon process.
-# The setting is particularly useful for tweaking memory settings.
 org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
-# When configured, Gradle will run in incubating parallel mode.
-# This option should only be used with decoupled projects. For more details, visit
-# https://developer.android.com/r/tools/gradle-multi-project-decoupled-projects
-# org.gradle.parallel=true
-# Kotlin code style for this project: "official" or "obsolete":
-kotlin.code.style=official
+kotlin.code.style=official