feat: Spec product version, build bake, Admin UI label.

Resolve VERSION from EventHubSpec; VITE_APP_BUILD from run_number; show Admin UI / API as version.build (sha).

Co-authored-by: Cursor <cursoragent@cursor.com>

src/locales/en.json

@@ -195,7 +195,7 @@
     "nodeMemory": "Memory: {{used}} / {{total}} MB ({{percent}}%)",
     "nodeWas": "was {{value}}%",
     "nodeAria": "{{node}}: CPU {{cpu}}%, memory {{memory}}%",
-    "adminVersion": "Admin {{version}}",
+    "adminVersion": "Admin UI {{version}}",
     "apiVersion": "API {{version}}",
     "apiVersionUnavailable": "API — unavailable"
   },