chore: rename plugin to headlamp-rook-plugin

Renames the plugin from headlamp-rook-ceph-plugin to headlamp-rook-plugin
across all files: package.json, package-lock.json, artifacthub-pkg.yml,
release workflow, README, CHANGELOG, CLAUDE.md, CONTRIBUTING, SECURITY,
and src/index.tsx.

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via [Happy](https://happy.engineering)

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

package-lock.json

@@ -1,11 +1,11 @@
 {
-  "name": "headlamp-rook-ceph-plugin",
+  "name": "headlamp-rook-plugin",
   "version": "0.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "headlamp-rook-ceph-plugin",
+      "name": "headlamp-rook-plugin",
       "version": "0.1.0",
       "license": "Apache-2.0",
       "devDependencies": {