Update database connection and storage for production

Adjusts database connection to use DATABASE_URL for production and switches to PostgreSQL storage when NODE_ENV is 'production'.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: a388004f-01c5-42b1-b1d1-f18daf8bdd0c
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/a388004f-01c5-42b1-b1d1-f18daf8bdd0c/h5q2Xzp

server/storage.ts

@@ -679,5 +679,7 @@ class MemStorageWithBackup extends MemStorage {
   }
 }
 
-// Use in-memory storage with backup functionality for now
-export const storage = new MemStorageWithBackup();
+// Use PostgreSQL storage in production, in-memory for development
+export const storage = process.env.NODE_ENV === 'production' 
+  ? new DatabaseStorage() 
+  : new MemStorageWithBackup();