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/application/route.ts

@@ -0,0 +1,34 @@
+export type AppRoute =
+  | { name: "home" }
+  | { name: "projects" }
+  | { name: "project"; id: string };
+
+export function readRoute(): AppRoute {
+  if (typeof window === "undefined") {
+    return { name: "home" };
+  }
+  const hash = window.location.hash.replace(/^#/, "");
+  if (hash === "/projects") {
+    return { name: "projects" };
+  }
+  const match = hash.match(/^\/project\/([^/]+)$/);
+  if (match) {
+    return { name: "project", id: decodeURIComponent(match[1]) };
+  }
+  return { name: "home" };
+}
+
+export function openHome() {
+  if (typeof window === "undefined") return;
+  window.location.hash = "/";
+}
+
+export function openProject(id: string) {
+  if (typeof window === "undefined") return;
+  window.location.hash = `/project/${encodeURIComponent(id)}`;
+}
+
+export function openProjects() {
+  if (typeof window === "undefined") return;
+  window.location.hash = "/projects";
+}