feat(t07+t44): GlitchTip + cron health + cleanup

feat(v3): ship new system — skip _legacy_main, mount v1 routers

feat(framework-10): per-tier rate limiting with FastAPI Depends

feat(framework-2): domain-specific error catalog with FastAPI handlers

feat(framework-6): kubernetes-grade health check hierarchy

feat(alerts): vertical slice — pure-Python domain + thin v1 route

feat(foundation): wire DeepSeek core/ modules into new main.py