Upgrade LogVar Barrage API runtime to upstream 1.21.5 (the published store image tracked upstream 1.21.1). Upstream publishes no release notes; the following summarises its default-branch commit history. Additions: dandan falls back to NipaPlay relay + Bangumi Data when detail sets are missing (#507); dandan302 association links are only served to sources enabled in SOURCE_ORDER (#489); aiyifan switches to the App API with year filled from the legacy web search API (#511). Fixes: merge tool strips quarter/type noise from matching titles (#506) and improves year/dubbed-version logic (#512); hanjutv first-search occasional empty results (#508); TMDB util strips season/part markers from Japanese original titles (#510); dandan model null defaults (#513); cache backend isolation and Local Redis restore (#492) plus backup log noise (#504); forward widget local-danmaku store isolation (#495, #488); dandan foreign-title search and TMDB pre-filter tuning (#493); mango variety-title ordering (#494); UI icon library for GitHub/param labels (#490). Adds GitHub Actions CI with offline test cases. Platform adaptation: the four deploy params were made optional and given manifest fallbacks identical to their default values so the app starts without entering them; passwordless access, LazyCat Drive interception and data persistence are unchanged.

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