docs: add project docs and test updates

e2e/admin.spec.js

@@ -40,7 +40,7 @@ test.describe('관리자 패널 — 지자체관리자', () => {
   });
 
   test('지정판매소 목록 접근', async ({ page }) => {
-    await page.goto('/admin/designated-shops');
+    await page.goto('/bag/designated-shops');
     await expect(page).toHaveURL(/\/admin\/designated-shops/);
   });