feat: comprehensive debug logging system with capture and download

Add a robust debug logging system that captures application state, user interactions, and system diagnostics for enhanced troubleshooting and development experience.

## ✨ Features Added

### 🔍 **Multi-Source Data Capture**
- **Console Logging**: Captures all console.log, console.warn, console.error
- **Error Handling**: Intercepts JavaScript errors and unhandled promise rejections
- **Network Monitoring**: Tracks all fetch requests with timing and status
- **User Actions**: Records user interactions and UI events
- **Terminal Activity**: Captures shell input/output with ANSI cleaning
- **Performance Metrics**: Memory usage, page load times, paint timing

### 📊 **System Information Collection**
- Platform detection (macOS, Windows, Linux)
- Browser and viewport information
- Git repository status (branch, commit, dirty state)
- Application state (model, provider, workbench view)
- Performance and memory statistics

### 🎯 **User Interface Integration**
- **Avatar Dropdown**: "Download Debug Log" option with download icon
- **Header Actions**: "Debug Log" button alongside existing "Report Bug"
- **One-Click Download**: Generates comprehensive debug reports
- **Error Handling**: Graceful degradation with user feedback

### 🔧 **Technical Implementation**
- **Circular Buffers**: Memory-efficient storage with fixed capacity (1K entries)
- **Lazy Loading**: Zero performance impact when disabled (default state)
- **Debouncing**: Terminal logs debounced at 100ms to prevent spam
- **JSON Safe**: Circular reference protection and depth limiting
- **Async Operations**: Non-blocking debug operations

### 📁 **Files Modified**
- `app/utils/debugLogger.ts` (1,284 lines) - Core debug logging utility
- `app/utils/logger.ts` - Integration with existing logging system
- `app/utils/shell.ts` - Terminal activity capture
- `app/components/@settings/core/AvatarDropdown.tsx` - UI integration
- `app/components/header/HeaderActionButtons.client.tsx` - Header button
- `app/root.tsx` - Initialization and setup
- `app/routes/api.git-info.ts` - Git information endpoint

## 🚀 **Benefits**

- **Enhanced Debugging**: Comprehensive data collection for issue reproduction
- **Performance Monitoring**: Built-in performance tracking and memory analysis
- **User Support**: Easy debug log generation for support tickets
- **Developer Experience**: Rich debugging data without performance penalty
- **Production Ready**: Opt-in system with zero impact on regular users

## 🔒 **Security & Privacy**

- Client-side only operation (no server transmission)
- User-controlled data collection and export
- No sensitive information captured automatically
- Manual opt-in required for debug mode activation

## 📈 **Performance Impact**

- **Disabled by Default**: No performance impact for regular users
- **Lazy Initialization**: Components loaded only when needed
- **Memory Bounded**: Fixed-size buffers prevent memory leaks
- **Non-Blocking**: All operations are asynchronous
- **Efficient Storage**: Circular buffers with automatic cleanup

## 🔄 **Integration Points**

- Seamlessly integrates with existing `logger` utility
- Compatible with current shell/terminal implementation
- Works with existing error handling patterns
- Maintains backward compatibility

This implementation provides developers and users with powerful debugging capabilities while maintaining excellent performance and user experience.

app/root.tsx

@@ -93,6 +93,24 @@ export default function App() {
       userAgent: navigator.userAgent,
       timestamp: new Date().toISOString(),
     });
+
+    // Initialize debug logging with improved error handling
+    import('./utils/debugLogger')
+      .then(({ debugLogger }) => {
+        /*
+         * The debug logger initializes itself and starts disabled by default
+         * It will only start capturing when enableDebugMode() is called
+         */
+        const status = debugLogger.getStatus();
+        logStore.logSystem('Debug logging ready', {
+          initialized: status.initialized,
+          capturing: status.capturing,
+          enabled: status.enabled,
+        });
+      })
+      .catch((error) => {
+        logStore.logError('Failed to initialize debug logging', error);
+      });
   }, []);
 
   return (