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/ImageGeneratorFloatingComposer/index.css

@@ -0,0 +1,181 @@
+.image-generator-floating-composer {
+  position: absolute;
+  z-index: 36;
+  min-height: 188px;
+  border: 1px solid #cbd2dc;
+  border-radius: 28px;
+  background: rgba(255, 255, 255, 0.98);
+  box-shadow: 0 18px 45px rgba(17, 24, 39, 0.14);
+  pointer-events: auto;
+}
+
+.image-generator-reference-row {
+  display: flex;
+  align-items: flex-start;
+  gap: 10px;
+  min-height: 72px;
+  margin: 14px 16px 0;
+}
+
+.image-generator-reference-tile,
+.image-generator-reference-preview {
+  width: 72px;
+  height: 72px;
+  border-radius: 20px;
+}
+
+.image-generator-reference-tile {
+  display: grid;
+  place-items: center;
+  gap: 6px;
+  color: #a6abb5;
+  background: #f4f4f4;
+  font-size: 12px;
+}
+
+.image-generator-reference-tile span {
+  display: block;
+}
+
+.image-generator-reference-preview {
+  position: relative;
+  flex: 0 0 auto;
+  overflow: visible;
+  background: #eef0f3;
+}
+
+.image-generator-reference-preview img {
+  display: block;
+  width: 100%;
+  height: 100%;
+  border-radius: 20px;
+  object-fit: cover;
+  user-select: none;
+  -webkit-user-drag: none;
+}
+
+.image-generator-reference-preview button {
+  position: absolute;
+  top: -8px;
+  right: -8px;
+  width: 26px;
+  height: 26px;
+  display: grid;
+  place-items: center;
+  border: 1px solid rgba(17, 24, 39, 0.08);
+  border-radius: 999px;
+  color: #1f2937;
+  background: #fff;
+  box-shadow: 0 8px 18px rgba(17, 24, 39, 0.16);
+}
+
+.image-generator-reference-preview button:hover {
+  background: #f5f6f8;
+}
+
+.image-generator-prompt-editor {
+  display: block;
+  box-sizing: border-box;
+  width: 100%;
+  min-height: 92px;
+  margin: 10px 0 0;
+  padding: 0 32px;
+  border: 0;
+  outline: 0;
+  resize: none;
+  color: #1f2937;
+  background: transparent;
+  caret-color: #111827;
+  font-family: inherit;
+  font-size: 18px;
+  font-weight: 520;
+  line-height: 26px;
+}
+
+.image-generator-prompt-editor::placeholder {
+  color: #a6acb6;
+  opacity: 1;
+}
+
+.image-generator-prompt-editor.is-locked {
+  color: #8b93a1;
+  cursor: default;
+  user-select: text;
+  caret-color: transparent;
+}
+
+.image-generator-prompt-editor.is-locked::placeholder {
+  color: #b7bdc7;
+}
+
+.image-generator-composer-toolbar {
+  display: flex;
+  align-items: center;
+  gap: 9px;
+  padding: 8px 14px 13px 28px;
+}
+
+.image-generator-settings-chip,
+.image-generator-model-button,
+.image-generator-send-button {
+  height: 36px;
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  flex: 0 0 auto;
+  border-radius: 999px;
+  color: #222831;
+  background: #fff;
+  font-size: 15px;
+  font-weight: 560;
+}
+
+.image-generator-settings-chip {
+  padding: 0 8px;
+}
+
+.image-generator-settings-chip:hover,
+.image-generator-model-button:hover {
+  background: #f3f4f6;
+}
+
+.image-generator-reference-tile:disabled,
+.image-generator-settings-chip:disabled,
+.image-generator-model-button:disabled {
+  cursor: default;
+  color: #9aa2af;
+  background: #f5f6f8;
+  opacity: 0.72;
+}
+
+.image-generator-composer-spacer {
+  flex: 1;
+}
+
+.image-generator-model-button {
+  max-width: 162px;
+  padding: 0 10px;
+  overflow: hidden;
+  white-space: nowrap;
+}
+
+.image-generator-model-button span {
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.image-generator-send-button {
+  min-width: 58px;
+  justify-content: center;
+  padding: 0 18px;
+  color: #fff;
+  background: #222;
+  font-weight: 760;
+}
+
+.image-generator-send-button:disabled {
+  color: #a5a9b0;
+  background: #efefef;
+  opacity: 1;
+}