Set up clean Firebase deploy workflow from git source

- Add @google-cloud/functions-framework and ts-node deps to match deployed
- Add .env.bak ignore patterns to firebase.json
- Fix adminService.ts: inline axios client (was importing non-existent module)
- Clean .env to exclude GCP Secret Manager secrets (prevents deploy overlap error)
- Verified: both frontend and backend build and deploy successfully

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/services/adminService.ts

@@ -1,4 +1,19 @@
-import { apiClient } from './documentService';
+import axios from 'axios';
+import { authService } from './authService';
+import { config } from '../config/env';
+
+const apiClient = axios.create({
+  baseURL: config.apiBaseUrl,
+  timeout: 300000,
+});
+
+apiClient.interceptors.request.use(async (reqConfig) => {
+  const token = await authService.getToken();
+  if (token) {
+    reqConfig.headers.Authorization = `Bearer ${token}`;
+  }
+  return reqConfig;
+});
 
 export interface AdminUser {
   id: string;