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.

routes/auth.ts

@@ -0,0 +1,20 @@
+import { Hono } from 'hono'
+import type { JwtVariables } from 'hono/jwt'
+import { authMiddleware } from '../auth.ts'
+
+const auth = new Hono<{ Variables: JwtVariables }>()
+
+auth.use('/*', authMiddleware)
+
+auth.get('/verify', (c) => {
+  const payload = c.get('jwtPayload')
+  return c.json({
+    code: 0,
+    data: {
+      username: payload.username,
+    },
+    message: '认证成功',
+  })
+})
+
+export default auth