[重构] 前端改造v1

atsf_server/web/app/(public)/oauth/github/page.tsx

@@ -0,0 +1,10 @@
+import { PublicRoutePlaceholder } from '@/features/auth/components/public-route-placeholder';
+
+export default function GithubOAuthPage() {
+  return (
+    <PublicRoutePlaceholder
+      title='GitHub OAuth 回调占位'
+      description='阶段 2 将在此接入授权回调处理、状态提示与跳转逻辑。'
+    />
+  );
+}