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/projman/skills/label-taxonomy/labels-reference.md

@@ -7,7 +7,7 @@ description: Dynamic reference for Gitea label taxonomy (organization + reposito
 
 **Status:** ✅ Synced with Gitea
 **Last synced:** 2025-11-21 (via automated testing)
-**Source:** Gitea (personal-projects/support-claude-mktplace)
+**Source:** Gitea (personal-projects/leo-claude-mktplace)
 
 ## Overview