feat(plugins): translate plugin UI in each app language

Keep translation resources and subscriptions inside each installation. Resolve host labels against the presentation locale so live language changes preserve mounted drafts and RPC state. Existing descriptor types retain string defaults for source compatibility.

package-lock.json

@@ -38907,6 +38907,7 @@
       "version": "0.12.0-beta.3",
       "dependencies": {
         "@agentclientprotocol/sdk": "^1.4.0",
+        "i18next": "^26.3.0",
         "use-sync-external-store": "^1.6.0"
       },
       "devDependencies": {