feat: implement authentication middleware and routes

- Added `auth.ts` for JWT authentication middleware.
- Created `auth` route to handle authentication and token verification.
- Integrated authentication middleware into `media.ts` for protected routes.
- Updated `main.ts` to register the new authentication route.

main.ts

@@ -9,6 +9,7 @@ import { jwt } from 'hono/jwt'
 import type { JwtVariables } from 'hono/jwt'
 import user from './routes/user.ts'
 import media from './routes/media.ts'
+import auth from './routes/auth.ts'
 
 const app = new Hono<{ Variables: JwtVariables }>()
 
@@ -20,6 +21,9 @@ app.use('*', async (c, next) => {
   await next()
 })
 
+// 注册认证路由
+app.route('/api/auth', auth)
+
 // 注册用户路由
 app.route('/api/user', user)