fix: correct marketplace.json format for Claude Code compatibility

- Rename marketplace from "unraid-mcp" to "jmagar-unraid-mcp" to match expected directory structure
- Wrap description, version, homepage, and repository in metadata object per standard format
- Fixes "Marketplace file not found" error when adding marketplace to Claude Code

Resolves marketplace installation issues by aligning with format used by other Claude Code marketplaces.

.claude-plugin/marketplace.json

@@ -1,14 +1,15 @@
 {
-  "name": "unraid-mcp",
+  "name": "jmagar-unraid-mcp",
-  "description": "Comprehensive Unraid server management and monitoring tools via GraphQL API",
-  "version": "0.2.0",
   "owner": {
     "name": "jmagar",
-    "email": "jmagar@users.noreply.github.com",
+    "email": "jmagar@users.noreply.github.com"
-    "url": "https://github.com/jmagar"
   },
+  "metadata": {
+    "description": "Comprehensive Unraid server management and monitoring tools via GraphQL API",
+    "version": "0.2.0",
     "homepage": "https://github.com/jmagar/unraid-mcp",
-  "repository": "https://github.com/jmagar/unraid-mcp",
+    "repository": "https://github.com/jmagar/unraid-mcp"
+  },
   "plugins": [
     {
       "name": "unraid",