fix: move node-forge to devDependencies for proper bundling

Moving node-forge from dependencies to devDependencies ensures it gets
bundled into the plugin instead of being externalized. This is required
because Headlamp doesn't provide node-forge as a shared library.

The .pluginrc file with empty externals forces bundling of all deps,
and keeping node-forge in devDependencies makes this behavior explicit.

This fixes the frontend loading error:
"TypeError: undefined is not an object (evaluating 'Ot.KubeObject')"

Changes:
- Moved node-forge from dependencies to devDependencies
- Updated package-lock.json to mark node-forge as dev dependency
- .pluginrc remains in place to enforce bundling

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

headlamp-sealed-secrets/package.json

@@ -56,13 +56,11 @@
   "overrides": {
     "typescript": "5.6.2"
   },
-  "dependencies": {
-    "node-forge": "^1.3.1"
-  },
   "devDependencies": {
     "@iconify/react": "^6.0.2",
     "@kinvolk/headlamp-plugin": "^0.13.0",
     "@types/node-forge": "^1.3.11",
+    "node-forge": "^1.3.1",
     "typedoc": "^0.28.16",
     "typedoc-plugin-markdown": "^4.10.0"
   }