feat: add Freebuff provider and fix dompurify security vulnerabilities

- Add Freebuff provider integration (executor, registry, OAuth, usage tracking)
- Upgrade monaco-editor to ^0.56.0
- Add dompurify ^3.4.13 with override to fix security vulnerabilities
- Add Freebuff provider icon and test files

package.json

@@ -26,12 +26,13 @@
     "@xyflow/react": "^12.10.1",
     "bcryptjs": "^3.0.3",
     "confbox": "^0.2.4",
+    "dompurify": "^3.4.13",
     "express": "^5.2.1",
     "http-proxy-middleware": "^3.0.5",
     "jose": "^6.1.3",
     "marked": "^18.0.1",
     "material-symbols": "^0.44.6",
-    "monaco-editor": "^0.55.1",
+    "monaco-editor": "^0.56.0",
     "next": "^16.1.6",
     "node-forge": "^1.3.3",
     "node-machine-id": "^1.1.12",
@@ -58,5 +59,8 @@
     "eslint-config-next": "16.1.6",
     "postcss": "^8.5.6",
     "tailwindcss": "^4"
+  },
+  "overrides": {
+    "dompurify": "^3.4.13"
   }
 }