Fix: import stripe in docstring, set Stripe key in start_server.py, add missing DB columns, fix frontend API URLs

backend/main.py

@@ -1,9 +1,10 @@
 """
 AutoJobs API — FastAPI Backend
 Multi-user job search with per-user API keys + subscription plans
+"""
+
 import os
 import stripe
-"""
 from fastapi import FastAPI, HTTPException, Depends, APIRouter, Request
 from fastapi.responses import JSONResponse
 from fastapi.middleware.cors import CORSMiddleware