refactor: rename npm package to headlamp-polaris-plugin

Aligns npm package name with the repo and ArtifactHub package name.
Updates all references: package.json, registerPluginSettings, Dockerfile,
release workflow tarball URLs, artifacthub-pkg.yml archive-url, and README.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/release.yaml

@@ -18,7 +18,7 @@ jobs:
       - name: Check if release is already finalized
         run: |
           VERSION=${GITHUB_REF_NAME#v}
-          TARBALL_URL="https://github.com/cpfarhood/headlamp-polaris-plugin/releases/download/${GITHUB_REF_NAME}/polaris-headlamp-plugin-${VERSION}.tar.gz"
+          TARBALL_URL="https://github.com/cpfarhood/headlamp-polaris-plugin/releases/download/${GITHUB_REF_NAME}/headlamp-polaris-plugin-${VERSION}.tar.gz"
           HTTP_CODE=$(curl -sL -o /tmp/release.tar.gz -w "%{http_code}" "$TARBALL_URL" 2>/dev/null)
           if [ "$HTTP_CODE" = "200" ]; then
             ACTUAL="sha256:$(sha256sum /tmp/release.tar.gz | awk '{print $1}')"
@@ -163,7 +163,7 @@ jobs:
           VERSION=${GITHUB_REF_NAME#v}
           git checkout main
           sed -i "s|headlamp/plugin/archive-checksum:.*|headlamp/plugin/archive-checksum: sha256:${CHECKSUM}|" artifacthub-pkg.yml
-          sed -i "s|headlamp/plugin/archive-url:.*|headlamp/plugin/archive-url: \"https://github.com/cpfarhood/headlamp-polaris-plugin/releases/download/${GITHUB_REF_NAME}/polaris-headlamp-plugin-${VERSION}.tar.gz\"|" artifacthub-pkg.yml
+          sed -i "s|headlamp/plugin/archive-url:.*|headlamp/plugin/archive-url: \"https://github.com/cpfarhood/headlamp-polaris-plugin/releases/download/${GITHUB_REF_NAME}/headlamp-polaris-plugin-${VERSION}.tar.gz\"|" artifacthub-pkg.yml
           sed -i "s|^version:.*|version: ${VERSION}|" artifacthub-pkg.yml
           git config user.name "gitea-actions[bot]"
           git config user.email "gitea-actions[bot]@git.farh.net"