fix: register google vertex setup provider

extensions/google/setup-api.ts

@@ -1,11 +1,13 @@
 import { definePluginEntry } from "openclaw/plugin-sdk/plugin-entry";
 import { buildGoogleGeminiCliBackend } from "./cli-backend.js";
+import { createGoogleVertexProvider } from "./provider-contract-api.js";
 
 export default definePluginEntry({
   id: "google",
   name: "Google Setup",
   description: "Lightweight Google setup hooks",
   register(api) {
+    api.registerProvider(createGoogleVertexProvider());
     api.registerCliBackend(buildGoogleGeminiCliBackend());
   },
 });