fix: add default PORT and improve Podman volume compatibility

docker-compose.yml

@@ -4,7 +4,7 @@ services:
     ports:
       - "3000:3000"
     volumes:
-      - .:/app
+      - .:/app:z
       - /app/node_modules
     command: bun run dev
     environment:

src/config.ts

@@ -1,7 +1,7 @@
 import { z } from "zod";
 
 const configSchema = z.object({
-	PORT: z.string(),
+	PORT: z.string().default("3000"),
 	REDIS_URL: z.string(),
 	API_KEY: z.string(),
 });