Add feature to automatically delete old sales data for legal compliance

Implements a data purge system, scheduler, and API endpoints for stats and manual execution.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 91318273-c764-4fd4-be04-bdc12c38af32
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/c3a86207-4ee0-47f9-8062-2dbbae696290.jpg

server/index.ts

@@ -2,6 +2,7 @@ import express, { type Request, Response, NextFunction } from "express";
 import { registerRoutes } from "./routes";
 import { setupVite, serveStatic, log } from "./vite";
 import { startBackupScheduler } from "./backup-scheduler";
+import { startPurgeScheduler } from "./data-purge";
 
 const app = express();
 app.use(express.json());
@@ -70,5 +71,8 @@ app.use((req, res, next) => {
     
     // Start the automatic backup scheduler
     startBackupScheduler();
+    
+    // Start the data purge scheduler
+    startPurgeScheduler();
   });
 })();