Phase 2: Performance Profiling Setup - Add profiling utilities

- Add StartupProfiler: Measure cold/warm start times
- Add VideoProfiler: Profile video load, playback metrics
- Add MemoryProfiler: Detect memory leaks, monitor heap growth
- Add HiveEncryptionBenchmark: Measure encryption overhead
- Add PHASE_2_PROFILING_PLAN.md: Complete testing procedures

Ready for profiling execution once Flutter SDK is initialized

lib/mobile/features/iptv/models/xtream_models.dart

@@ -0,0 +1,8 @@
+/// Xtream API Data Models - Mobile Version
+/// 
+/// This is a minimal stub to support mobile imports.
+/// Full models are in core/models/iptv_models.dart
+library;
+
+// Re-export from core for compatibility
+export '../../../core/models/iptv_models.dart';

lib/mobile/features/iptv/services/xtream_service_mobile.dart

@@ -0,0 +1,14 @@
+/// Xtream Codes API Service - Mobile Version
+///
+/// Handles Xtream API communication for mobile platforms.
+/// This is a minimal stub for import compatibility.
+library;
+
+import '../models/xtream_models.dart' as xm;
+
+/// Xtream API Service for Mobile
+/// 
+/// Placeholder implementation for mobile video streaming.
+class XtreamServiceMobile {
+  // Minimal stub implementation
+}