Initial commit: img-infinite-canvas AI design workbench MVP

Moteva-style AI design workbench replica. Home prompt creates a project;
the project page provides an infinite canvas with node drag, zoom/pan,
a design chat panel, history replay, image asset upload, and project
save/regenerate.

- Backend: go-zero, DDD layering, sqlc/pgx, optional PostgreSQL; memory
  or Redis cache; asynq job queue; MinIO/S3/R2/OSS object storage;
  sky-valley/pi agent runtime adapter.
- Frontend: Next.js App Router + Vite artifact build, TypeScript, i18n,
  shadcn/ui components, auth (OTP/Turnstile/Google/WeChat).
- Deploy: Docker Compose and k3s manifests.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/ui/App.tsx

@@ -0,0 +1,40 @@
+"use client";
+
+import { Loader2 } from "lucide-react";
+import { useEffect, useState } from "react";
+import { readRoute, type AppRoute } from "@/application/route";
+import { CanvasWorkspace } from "@/ui/pages/CanvasWorkspace";
+import { HomePage } from "@/ui/pages/HomePage";
+import { ProjectsRoutePage } from "@/ui/pages/ProjectsRoutePage";
+import { useAuth } from "@/ui/auth/AuthProvider";
+
+export function App() {
+  const { isAuthenticated, openLogin } = useAuth();
+  const [route, setRoute] = useState<AppRoute | null>(null);
+
+  useEffect(() => {
+    setRoute(readRoute());
+    const handleRoute = () => setRoute(readRoute());
+    window.addEventListener("hashchange", handleRoute);
+    return () => window.removeEventListener("hashchange", handleRoute);
+  }, []);
+
+  useEffect(() => {
+    if (route?.name === "project" && !isAuthenticated) {
+      openLogin();
+    }
+  }, [isAuthenticated, openLogin, route]);
+
+  if (!route) {
+    return (
+      <div className="workspace-loading">
+        <Loader2 className="spin" size={28} />
+      </div>
+    );
+  }
+
+  if (route.name === "project" && !isAuthenticated) return <HomePage />;
+  if (route.name === "project") return <CanvasWorkspace projectId={route.id} />;
+  if (route.name === "projects") return <ProjectsRoutePage />;
+  return <HomePage />;
+}