feat: add authentication modal component and user authentication logic

- Implemented AuthModal.vue for user login and registration with form handling.
- Created useAuth composable for managing user state and authentication requests.
- Added admin route middleware to protect admin routes.
- Developed admin login page with authentication checks.
- Implemented API endpoints for user management (login, logout, fetch user, register).
- Created database migrations for users table and updated movies table.
- Added utility functions for password hashing and JWT token management.

server/middleware/auth.ts

@@ -0,0 +1,23 @@
+import { getTokenFromEvent, verifyToken } from '../utils/auth'
+
+export default defineEventHandler((event) => {
+  const path = event.path || event.node?.req?.url || ''
+
+  if (!path.startsWith('/api/admin')) return
+
+  const token = getTokenFromEvent(event)
+  if (!token) {
+    throw createError({ statusCode: 401, message: 'Chưa đăng nhập' })
+  }
+
+  const payload = verifyToken(token)
+  if (!payload) {
+    throw createError({ statusCode: 401, message: 'Phiên đăng nhập hết hạn' })
+  }
+
+  if (payload.role !== 'admin') {
+    throw createError({ statusCode: 403, message: 'Không có quyền truy cập' })
+  }
+
+  event.context.user = payload
+})