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>

plugins/code-sentinel/README.md

@@ -38,7 +38,7 @@ Security scanning and code refactoring tools for Claude Code projects.
 ## Installation
 
 ```bash
-/plugin marketplace add https://gitea.hotserv.cloud/personal-projects/support-claude-mktplace.git
+/plugin marketplace add https://gitea.hotserv.cloud/personal-projects/leo-claude-mktplace.git
 /plugin install code-sentinel
 ```