chore: release v5.4.0

- CHANGELOG.md: [Unreleased] → [5.4.0] - 2026-01-28
- README.md: title → v5.4.0
- marketplace.json: version → 5.4.0
- CLAUDE.md: version → 5.4.0

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

.claude-plugin/marketplace.json

@@ -6,7 +6,7 @@
   },
   "metadata": {
     "description": "Project management plugins with Gitea and NetBox integrations",
-    "version": "5.3.0"
+    "version": "5.4.0"
   },
   "plugins": [
     {