Add file upload capability to the system

Integrate Busboy to handle multipart/form-data requests for file uploads.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 06ccc22f-0202-44ef-842e-1398da8ca1f8
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: bfef1078-7f0e-4c03-aedc-d4660547e68a

server/routes.ts

@@ -4,6 +4,7 @@ import { storage } from "./storage";
 import { setupLocalAuth, requireAuth } from "./localAuth";
 import { requireModulePermission, requireAdmin, requirePermission } from "./permissions";
 import { db, pool } from "./db";
+import Busboy from "busboy";
 
 console.log('🔍 Using development storage and authentication');