fix: update PrismaService constructor to use correct datasource format and include prisma.config.ts in Dockerfile

backend/src/prisma/prisma.service.ts

@@ -9,7 +9,7 @@ export class PrismaService
   private readonly logger = new Logger(PrismaService.name);
 
   constructor() {
-    super({ datasourceUrl: process.env.DATABASE_URL });
+    super({ datasources: { db: { url: process.env.DATABASE_URL } } });
   }
 
   async onModuleInit() {