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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "gitea-mirror",
   "type": "module",
-  "version": "3.5.4",
+  "version": "3.6.0",
   "engines": {
     "bun": ">=1.2.9"
   },
@@ -47,6 +47,7 @@
     "@astrojs/node": "9.4.3",
     "@astrojs/react": "^4.3.1",
     "@better-auth/sso": "^1.3.8",
+    "@octokit/plugin-throttling": "^11.0.1",
     "@octokit/rest": "^22.0.0",
     "@radix-ui/react-accordion": "^1.2.12",
     "@radix-ui/react-avatar": "^1.1.10",
@@ -57,6 +58,7 @@
     "@radix-ui/react-hover-card": "^1.1.15",
     "@radix-ui/react-label": "^2.1.7",
     "@radix-ui/react-popover": "^1.1.15",
+    "@radix-ui/react-progress": "^1.1.7",
     "@radix-ui/react-radio-group": "^1.3.8",
     "@radix-ui/react-scroll-area": "^1.2.10",
     "@radix-ui/react-select": "^2.2.6",