CHORE(app): initial configuration

- Add initial app settings
- Configure base deployment

services/nextjs/src/shared/api/config.ts

@@ -0,0 +1,10 @@
+// API 설정 - Next.js API Routes 사용
+export const API_CONFIG = {
+  baseURL: process.env.NEXT_PUBLIC_API_URL || '',
+  timeout: 10000,
+}
+
+export const API_ENDPOINTS = {
+  todos: '/api/todos',
+  health: '/api/health',
+} as const