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/routes/api.git-info.ts

@@ -0,0 +1,69 @@
+import { json } from '@remix-run/cloudflare';
+import { execSync } from 'child_process';
+import { existsSync } from 'fs';
+
+export async function loader() {
+  try {
+    // Check if we're in a git repository
+    if (!existsSync('.git')) {
+      return json({
+        branch: 'unknown',
+        commit: 'unknown',
+        isDirty: false,
+      });
+    }
+
+    // Get current branch
+    const branch = execSync('git rev-parse --abbrev-ref HEAD', { encoding: 'utf8' }).trim();
+
+    // Get current commit hash
+    const commit = execSync('git rev-parse HEAD', { encoding: 'utf8' }).trim();
+
+    // Check if working directory is dirty
+    const statusOutput = execSync('git status --porcelain', { encoding: 'utf8' });
+    const isDirty = statusOutput.trim().length > 0;
+
+    // Get remote URL
+    let remoteUrl: string | undefined;
+
+    try {
+      remoteUrl = execSync('git remote get-url origin', { encoding: 'utf8' }).trim();
+    } catch {
+      // No remote origin, leave as undefined
+    }
+
+    // Get last commit info
+    let lastCommit: { message: string; date: string; author: string } | undefined;
+
+    try {
+      const commitInfo = execSync('git log -1 --pretty=format:"%s|%ci|%an"', { encoding: 'utf8' }).trim();
+      const [message, date, author] = commitInfo.split('|');
+      lastCommit = {
+        message: message || 'unknown',
+        date: date || 'unknown',
+        author: author || 'unknown',
+      };
+    } catch {
+      // Could not get commit info
+    }
+
+    return json({
+      branch,
+      commit,
+      isDirty,
+      remoteUrl,
+      lastCommit,
+    });
+  } catch (error) {
+    console.error('Error fetching git info:', error);
+    return json(
+      {
+        branch: 'error',
+        commit: 'error',
+        isDirty: false,
+        error: error instanceof Error ? error.message : 'Unknown error',
+      },
+      { status: 500 },
+    );
+  }
+}