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/components/ProjectCard/index.css

@@ -0,0 +1,161 @@
+.project-grid {
+  display: grid;
+  grid-template-columns: repeat(4, minmax(0, 1fr));
+  gap: 28px;
+}
+
+.new-project-card,
+.project-card {
+  min-width: 0;
+  text-align: left;
+  background: transparent;
+}
+
+.new-project-card {
+  aspect-ratio: 4 / 3;
+  display: grid;
+  place-items: center;
+  align-content: center;
+  gap: 16px;
+  border: 2px dashed #cbd2dc;
+  border-radius: 8px;
+  color: #111827;
+  background: rgba(255, 255, 255, 0.58);
+  font-weight: 800;
+}
+
+.new-project-card span {
+  width: 54px;
+  height: 54px;
+  display: grid;
+  place-items: center;
+  border-radius: 999px;
+  background: var(--surface-muted);
+}
+
+.new-project-card:hover {
+  border-color: #050505;
+  background: #fff;
+}
+
+.project-card {
+  position: relative;
+  display: grid;
+  grid-template-rows: auto auto auto;
+  gap: 12px;
+  width: 100%;
+}
+
+.project-card-shell {
+  position: relative;
+  min-width: 0;
+}
+
+.project-card-shell.is-selecting .project-card {
+  cursor: pointer;
+}
+
+.project-card-shell.selected .project-thumb {
+  border-color: #2563eb;
+  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.18), var(--shadow-sm);
+}
+
+.project-card-selection {
+  position: absolute;
+  top: 10px;
+  left: 10px;
+  z-index: 4;
+  width: 26px;
+  height: 26px;
+  display: grid;
+  place-items: center;
+  border: 1px solid rgba(255, 255, 255, 0.92);
+  border-radius: 999px;
+  color: #fff;
+  background: rgba(17, 24, 39, 0.36);
+  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.14);
+}
+
+.project-card-shell.selected .project-card-selection {
+  background: #2563eb;
+}
+
+.project-delete-button {
+  position: absolute;
+  top: 10px;
+  right: 10px;
+  z-index: 4;
+  width: 28px;
+  height: 28px;
+  display: grid;
+  place-items: center;
+  border-radius: 999px;
+  color: #111827;
+  background: rgba(255, 255, 255, 0.86);
+  opacity: 0;
+  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.14);
+  transition: opacity 0.18s ease, transform 0.18s ease;
+}
+
+.project-card-shell:hover .project-delete-button,
+.project-delete-button:focus-visible {
+  opacity: 1;
+}
+
+.project-delete-button:hover {
+  transform: scale(1.04);
+  color: #b42318;
+}
+
+.project-card .project-thumb,
+.project-card-overlay {
+  grid-column: 1;
+  grid-row: 1;
+}
+
+.project-card-overlay {
+  z-index: 2;
+  display: grid;
+  place-items: center;
+  border-radius: 8px;
+  color: #050505;
+  background: rgba(255, 255, 255, 0.78);
+  opacity: 0;
+  transform: translateY(8px);
+  transition: opacity 0.2s ease, transform 0.2s ease;
+  font-size: 13px;
+  font-weight: 900;
+  backdrop-filter: blur(8px);
+}
+
+.project-card:hover .project-card-overlay {
+  opacity: 1;
+  transform: translateY(0);
+}
+
+.project-card strong {
+  overflow: hidden;
+  color: #111827;
+  font-size: 17px;
+  line-height: 1.25;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.project-card small {
+  color: #7d8492;
+  font-size: 13px;
+  font-weight: 700;
+}
+
+@media (max-width: 980px) {
+  .project-grid {
+    grid-template-columns: 1fr 1fr;
+  }
+}
+
+@media (max-width: 640px) {
+  .project-grid {
+    grid-template-columns: 1fr;
+  }
+}

frontend/src/ui/components/ProjectCard/index.tsx

@@ -0,0 +1,45 @@
+"use client";
+
+import { Check, X } from "lucide-react";
+import type { ProjectSummary } from "@/domain/design";
+import { useI18n } from "@/i18n/i18n";
+import { ProjectThumb } from "@/ui/components/ProjectThumb";
+
+type ProjectCardProps = {
+  project: ProjectSummary;
+  editMode?: boolean;
+  selected?: boolean;
+  onActivate: () => void;
+  onDelete?: () => void;
+};
+
+export function ProjectCard({ project, editMode = false, selected = false, onActivate, onDelete }: ProjectCardProps) {
+  const { t, locale } = useI18n();
+
+  return (
+    <div className={`project-card-shell ${editMode ? "is-selecting" : ""} ${selected ? "selected" : ""}`}>
+      {editMode && (
+        <span className="project-card-selection" aria-hidden="true">
+          {selected && <Check size={14} />}
+        </span>
+      )}
+      <button className="project-card" onClick={onActivate} aria-pressed={editMode ? selected : undefined}>
+        <ProjectThumb variant={project.thumbnail} />
+        {!editMode && <span className="project-card-overlay">{t("continueEditing")}</span>}
+        <strong>{project.title}</strong>
+        <small>{formatProjectDate(project.updatedAt, locale)}</small>
+      </button>
+      {!editMode && onDelete && (
+        <button className="project-delete-button" aria-label={t("contextDelete")} onClick={onDelete}>
+          <X size={14} />
+        </button>
+      )}
+    </div>
+  );
+}
+
+function formatProjectDate(value: string, locale: string) {
+  const date = new Date(value);
+  if (Number.isNaN(date.getTime())) return value;
+  return new Intl.DateTimeFormat(locale, { month: "short", day: "numeric", hour: "2-digit", minute: "2-digit" }).format(date);
+}