chore: publish plugins to self-hosted Gitea

Add publish:gitea wrapper that sets USER_CONTENT_BASE to Gitea raw URLs,
and resolve the lockfile's npmmirror tarballs from registry.npmjs.org.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

package-lock.json

@@ -4943,7 +4943,7 @@
     },
     "node_modules/domhandler": {
       "version": "5.0.3",
-      "resolved": "https://registry.npmmirror.com/domhandler/-/domhandler-5.0.3.tgz",
+      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-5.0.3.tgz",
       "integrity": "sha512-cgwlv/1iFQiFnU96XXgROh8xTeetsnJiDsTc7TYCLFd9+/WNkIqPTxiM/8pSd8VIrhXGTf1Ny1q1hquVqDJB5w==",
       "dev": true,
       "license": "BSD-2-Clause",
@@ -12590,7 +12590,7 @@
     },
     "domhandler": {
       "version": "5.0.3",
-      "resolved": "https://registry.npmmirror.com/domhandler/-/domhandler-5.0.3.tgz",
+      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-5.0.3.tgz",
       "integrity": "sha512-cgwlv/1iFQiFnU96XXgROh8xTeetsnJiDsTc7TYCLFd9+/WNkIqPTxiM/8pSd8VIrhXGTf1Ny1q1hquVqDJB5w==",
       "dev": true,
       "requires": {