Initial commit: AI Video Assistant fullstack platform.

Add pipecat-based backend with WebRTC/WS voice routes, Next.js frontend, and Docker Compose orchestration.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/pages/TestPage.tsx

@@ -0,0 +1,10 @@
+import { PlaceholderPage } from "./PlaceholderPage";
+
+export function TestPage() {
+  return (
+    <PlaceholderPage
+      title="测试助手"
+      description="在发布前通过实时视频对话测试助手的表现与交互体验。"
+    />
+  );
+}