Phase 3: Architecture refactor - consolidate folders and extract patterns

- Consolidate lib/mobile/features/iptv → lib/features/iptv
  * Move all IPTV screens, models, services, widgets to unified location
  * Update imports in main.dart and affected files
  * Remove old mobile/features/iptv directory

- Create lib/core/patterns/ for reusable implementations
  * HiveServiceBase: Template for Hive-based persistent storage
  * VideoPlayerWrapper: Abstraction for video player selection
  * StreamResolverPattern: IPTV stream resolution and validation

- Router already simplified (no kIsWeb checks, Android-only)

All changes maintain Android-only architecture and improve maintainability.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

lib/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
+}