- runtime.uc: add sing_box_repo_url to build_system_info() based on installed variant (extended→shtorm-7, lx→Leadaxe, stable→SagerNet) - main.js: use systemInfo.sing_box_repo_url instead of hardcoded URL - README.md / README.en.md: expanded Watchdog section with all 14 fixes, atomic operations, restart protection, data correctness, Telegram rate limits, firewall improvements, dynamic repo links, commit-level update tracking