Added Github API rate limiting

- Implemented comprehensive GitHub API rate limit handling:
    - Integrated @octokit/plugin-throttling for automatic retry with exponential backoff
    - Added RateLimitManager service to track and enforce rate limits
    - Store rate limit status in database for persistence across restarts
    - Automatic pause and resume when limits are exceeded
    - Proper user identification for 5000 req/hr authenticated limit (vs 60 unauthenticated)

  - Improved rate limit UI/UX:
    - Removed intrusive rate limit card from dashboard
    - Toast notifications only at critical thresholds (80% and 100% usage)
    - All rate limit events logged for debugging

  - Optimized for GitHub's API constraints:
    - Reduced default batch size from 10 to 5 repositories
    - Added documentation about GitHub's 100 concurrent request limit
    - Better handling of repositories with many issues/PRs

src/lib/recovery.ts

@@ -260,11 +260,13 @@ async function recoverMirrorJob(job: any, remainingItemIds: string[]) {
       throw new Error('GitHub token not found in configuration');
     }
 
-    // Create GitHub client with error handling
+    // Create GitHub client with error handling and rate limit tracking
     let octokit;
     try {
       const decryptedToken = getDecryptedGitHubToken(config);
-      octokit = createGitHubClient(decryptedToken);
+      const githubUsername = config.githubConfig?.owner || undefined;
+      const userId = config.userId || undefined;
+      octokit = createGitHubClient(decryptedToken, userId, githubUsername);
     } catch (error) {
       throw new Error(`Failed to create GitHub client: ${error instanceof Error ? error.message : String(error)}`);
     }