新增图片生成像素艺术后处理

新增确定性像素网格规整模块并保留第三方 MIT 许可证。

为普通图片、角色和图标图集接入像素艺术选项、并发预算和失败降级。

同步前端交互、请求契约、OpenAPI、项目文档与测试。

src/index.css

@@ -7079,6 +7079,33 @@ button.image-canvas-editor__reference-chip:disabled {
   width: 8.5rem;
 }
 
+.image-canvas-editor__image-style-toggle {
+  grid-column: 3;
+  display: inline-flex;
+  min-height: 2.25rem;
+  align-items: center;
+  justify-self: end;
+  gap: 0.38rem;
+  padding: 0 0.5rem;
+  color: #475569;
+  font-size: 0.78rem;
+  font-weight: 760;
+  white-space: nowrap;
+  cursor: pointer;
+}
+
+.image-canvas-editor__image-style-toggle input {
+  width: 0.95rem;
+  height: 0.95rem;
+  margin: 0;
+  accent-color: var(--image-canvas-brand-fill);
+}
+
+.image-canvas-editor__image-style-toggle:has(input:disabled) {
+  color: #94a3b8;
+  cursor: wait;
+}
+
 .image-canvas-editor__model-trigger-label {
   display: inline-flex;
   min-width: 0;
@@ -8904,6 +8931,7 @@ button.image-canvas-editor__reference-chip:disabled {
 
   .image-canvas-editor__option-cluster--dimensions,
   .image-canvas-editor__option-cluster--model,
+  .image-canvas-editor__image-style-toggle,
   .image-canvas-editor__readonly-generation-option,
   .image-canvas-editor__generation-submit,
   .image-canvas-editor__character-animation-submit {
@@ -8913,6 +8941,10 @@ button.image-canvas-editor__reference-chip:disabled {
     justify-self: stretch;
   }
 
+  .image-canvas-editor__image-style-toggle {
+    justify-content: flex-start;
+  }
+
   .image-canvas-editor__generation-submit {
     width: 100%;
   }