feat: Add TorrentEngine library and new API client

- Created complete TorrentEngine library module with LibTorrent4j
  - Full torrent management (add, pause, resume, remove)
  - Magnet link metadata extraction
  - File priority management (even during download)
  - Foreground service with persistent notification
  - Room database for state persistence
  - Reactive Flow API for UI updates

- Integrated TorrentEngine with MainActivity via MethodChannel
  - addTorrent, getTorrents, pauseTorrent, resumeTorrent, removeTorrent
  - setFilePriority for dynamic file selection
  - Full JSON serialization for Flutter communication

- Created new NeoMoviesApiClient for Go-based backend
  - Email verification flow (register, verify, resendCode)
  - Google OAuth support
  - Torrent search via RedAPI
  - Multiple player support (Alloha, Lumex, Vibix)
  - Enhanced reactions system (likes/dislikes)
  - All movies/TV shows endpoints

- Updated dependencies and build configuration
  - Java 17 compatibility
  - Updated Kotlin coroutines to 1.9.0
  - Fixed build_runner version conflict
  - Added torrentengine module to settings.gradle.kts

- Added comprehensive documentation
  - TorrentEngine README with usage examples
  - DEVELOPMENT_SUMMARY with full implementation details
  - ProGuard rules for library

This is a complete rewrite of torrent functionality as a reusable library.

android/torrentengine/proguard-rules.pro

@@ -0,0 +1,27 @@
+# Add project specific ProGuard rules here.
+# Keep LibTorrent4j classes
+-keep class org.libtorrent4j.** { *; }
+-keepclassmembers class org.libtorrent4j.** { *; }
+
+# Keep TorrentEngine public API
+-keep public class com.neomovies.torrentengine.TorrentEngine {
+    public *;
+}
+
+# Keep models
+-keep class com.neomovies.torrentengine.models.** { *; }
+
+# Keep Room database classes
+-keep class * extends androidx.room.RoomDatabase
+-keep @androidx.room.Entity class *
+-dontwarn androidx.room.paging.**
+
+# Gson
+-keepattributes Signature
+-keepattributes *Annotation*
+-dontwarn sun.misc.**
+-keep class com.google.gson.** { *; }
+-keep class * implements com.google.gson.TypeAdapter
+-keep class * implements com.google.gson.TypeAdapterFactory
+-keep class * implements com.google.gson.JsonSerializer
+-keep class * implements com.google.gson.JsonDeserializer