- Remove "来源/分类" (category.php) link from main navigation
- Relocate "cppreference" to end of menu, after contest-related items
- Add conditional "AI 聊天" section using `$OJ_AI_HTML` variable
- Update LLM model from `MiniMax-M2.7` to `MiniMax-M3` in db_info.inc.php
- Fix trailing whitespace in header.php template
- Add new `gitpull.php` page for manual git pull execution by administrators
- Remove automatic git pull on homepage visit to prevent unintended updates
- Include git pull link in admin navigation menu for easy access
- Secure interface with admin-only access and sudo credentials configuration
