feat: update Docker configuration and .gitignore, remove unused JSON files

frontend/proxy.ts

@@ -75,7 +75,7 @@ export async function proxy(request: NextRequest) {
   if (token) {
     try {
       const { payload: p } = await jwtVerify(token, getSecretKey(), { algorithms: ['HS256'] })
-      payload = p
+      payload = p as { userId?: string; username?: string; role?: string }
     } catch {
       // expired or tampered — treat as unauthenticated
     }