Add Flutter LoRA support and fix struct alignment crash

Fix critical 4-byte struct misalignment in RacModelInfoCStruct (missing
supports_lora field) causing memory corruption. Add complete LoRA FFI
bindings, bridge layer, public API, and types for Flutter feature parity
with iOS/Kotlin.

Author: Siddhesh2377

sdk/runanywhere-flutter/packages/runanywhere/lib/native/dart_bridge.dart

@@ -29,6 +29,7 @@ import 'package:runanywhere/native/dart_bridge_tts.dart';
 import 'package:runanywhere/native/dart_bridge_vad.dart';
 import 'package:runanywhere/native/dart_bridge_vlm.dart';
 import 'package:runanywhere/native/dart_bridge_voice_agent.dart';
+import 'package:runanywhere/native/dart_bridge_lora.dart';
 import 'package:runanywhere/native/dart_bridge_rag.dart';
 import 'package:runanywhere/native/platform_loader.dart';
 import 'package:runanywhere/public/configuration/sdk_environment.dart';
@@ -317,6 +318,13 @@ class DartBridge {
   /// RAG pipeline bridge
   static DartBridgeRAG get rag => DartBridgeRAG.shared;
 
+  /// LoRA adapter bridge
+  static DartBridgeLora get lora => DartBridgeLora.shared;
+
+  /// LoRA registry bridge
+  static DartBridgeLoraRegistry get loraRegistry =>
+      DartBridgeLoraRegistry.shared;
+
   // -------------------------------------------------------------------------
   // Private Helpers
   // -------------------------------------------------------------------------