feat: MCP Server para control de impresoras

- Endpoint HTTP JSON-RPC en /api/mcp
- 6 tools: list_templates, list_printers, print_template, print_raw, create_template, update_template
- Guia de formato para impresora TM-U220
- Protegido por Authentik forward auth

package.json

@@ -10,6 +10,7 @@
     "postinstall": "nuxt prepare"
   },
   "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.22.0",
     "@nuxt/ui": "^4.1.0",
     "@vite-pwa/nuxt": "^1.0.7",
     "axios": "^1.13.2",