feat(worktree): add AI commit message generation feature

- Implemented a new endpoint to generate commit messages based on git diffs.
- Updated worktree routes to include the AI commit message generation functionality.
- Enhanced the UI to support automatic generation of commit messages when the commit dialog opens, based on user settings.
- Added settings for enabling/disabling AI-generated commit messages and configuring the model used for generation.

apps/ui/src/lib/electron.ts

@@ -1538,11 +1538,10 @@ function createMockWorktreeAPI(): WorktreeAPI {
     },
 
     generateCommitMessage: async (worktreePath: string) => {
-      console.log('[Mock] Generating commit message:', { worktreePath });
+      console.log('[Mock] Generating commit message for:', worktreePath);
       return {
         success: true,
-        message:
-          'feat: Add new feature implementation\n\nThis is a mock AI-generated commit message.',
+        message: 'feat: Add mock commit message generation',
       };
     },