feat(oauth): add vertex json login via vertex/import

src/services/api/index.ts

@@ -11,3 +11,4 @@ export * from './logs';
 export * from './version';
 export * from './models';
 export * from './transformers';
+export * from './vertex';

src/services/api/vertex.ts

@@ -0,0 +1,25 @@
+/**
+ * Vertex credential import API
+ */
+
+import { apiClient } from './client';
+
+export interface VertexImportResponse {
+  status: 'ok';
+  project_id?: string;
+  email?: string;
+  location?: string;
+  'auth-file'?: string;
+  auth_file?: string;
+}
+
+export const vertexApi = {
+  importCredential: (file: File, location?: string) => {
+    const formData = new FormData();
+    formData.append('file', file);
+    if (location) {
+      formData.append('location', location);
+    }
+    return apiClient.postForm<VertexImportResponse>('/vertex/import', formData);
+  }
+};