chore(release): 2.0.0 — drop -alpha; Void 1 retired, CTs renamed

Void 2 reaches GA. Void 1 (CT 301) was stopped, fully backed up (vzdump +
off-CT data tarball), and destroyed; CT 310/311 renamed void-db/void-app;
the legacy void1 registry tile removed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "void-server",
-  "version": "2.0.0-alpha.27",
+  "version": "2.0.0",
   "type": "module",
   "private": true,
   "scripts": {