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Switch UpdateChecker source from api.github.com (flaky in CN) to the self-hosted Gitea at git.sunlunfan.com. Releases must now be published to Gitea too (github stays as mirror). parseRelease unchanged — Gitea API fields are GitHub-compatible. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>