- Fix lint errors in AI learning MCP tools (interface{} -> any, append pattern)
- Update OAuth realm names from Gitea to GitCaddy
- Update User-Agent strings to GitCaddy
- Update default git user.name, mailer X-Mailer header
- Update API docs descriptions
- Update template comments and swagger descriptions
- Keep Gitea attribution in footer and as OAuth provider option
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>