Phase 2: Add Network Bypass for offline mode

- Created OfflineModeManager.smali (toggle offline mode)
- Created OfflineResponseMock.smali (mock API responses)
- Modified NetworkImpl to check offline mode
- Modified MainActivity initialization
- Builds successfully

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

smali_classes2/com/firemint/realracing/MainActivity.smali

@@ -2240,6 +2240,9 @@
     # Initialize LocalSaveManager for offline mode
     invoke-static {p0}, Lcom/firemint/realracing/LocalSaveManager;->initSaveFile(Landroid/content/Context;)V
 
+    # Initialize OfflineModeManager
+    invoke-static {p0}, Lcom/firemint/realracing/OfflineModeManager;->init(Landroid/content/Context;)V
+
     .line 353
     invoke-virtual {p0}, Landroid/app/Activity;->getApplication()Landroid/app/Application;