- Bundle universal 17-byte empty SRS stub and add is_valid_srs_file/ensure_empty_srs_stub in rulesets.uc
- Add prepare_community_rulesets in lifecycle.uc to pre-fetch via gh-proxy mirrors or initialize safe local stub before sing-box start
- Support local community rulesets and stubs in generator_routes.uc
- Add fallback to component proxy for list downloads in updates.uc and preserve cached stubs
- Skip non-functional jsdelivr for release downloads and prioritize gh-proxy mirrors in core/url.uc
- Add tests/cold_boot_community_stub.sh testing cold boot fallback behavior
