chore: rename marketplace to Leo Claude Marketplace

Update all references from old names to new marketplace identity:
- support-claude-mktplace → leo-claude-mktplace (URLs)
- lm-claude-plugins → leo-claude-mktplace (repo name)
- Claude Code Marketplace → Leo Claude Marketplace (display name)

Files updated:
- Core docs (CLAUDE.md, README.md, CHANGELOG.md)
- Documentation (CANONICAL-PATHS, CONFIGURATION, UPDATING, COMMANDS-CHEATSHEET)
- Marketplace manifest and all 9 plugin.json files
- Plugin READMEs and MCP server READMEs
- Setup script and label taxonomy reference

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

mcp-servers/gitea/README.md

@@ -389,7 +389,7 @@ def list_issues(self, state='open', labels=None, repo=None):
 
 ## License
 
-MIT License - Part of the Claude Code Marketplace project.
+MIT License - Part of the Leo Claude Marketplace project.
 
 ## Related Documentation
 
@@ -406,7 +406,7 @@ For issues or questions:
 
 ---
 
-**Built for**: Claude Code Marketplace - Project Management Plugins
+**Built for**: Leo Claude Marketplace - Project Management Plugins
 **Phase**: 1 (Complete)
 **Status**: ✅ Production Ready
 **Last Updated**: 2025-01-06