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/components/image-editor/ImageCanvasGenerationSubmissionModel.test.ts

@@ -47,6 +47,7 @@ describe('ImageCanvasGenerationSubmissionModel', () => {
       input: {
         prompt: '一张发光主视觉',
         model: 'gemini-3.1-flash-image-preview',
+        style: 'none',
         aspectRatio: '1:1',
         imageSize: '1K',
       },
@@ -193,6 +194,24 @@ describe('ImageCanvasGenerationSubmissionModel', () => {
     });
   });
 
+  it('does not send image style from an incomplete quick-edit snapshot', () => {
+    const plan = buildImageGenerationSubmissionPlan({
+      dialog: {
+        mode: 'quick-edit',
+        prompt: '把当前图改成雨天',
+        status: 'idle',
+        style: 'pixelArt',
+      },
+      layers: [],
+      nextGeneratedIndex: 4,
+    });
+
+    expect(plan.kind).toBe('image');
+    expect(plan.kind === 'image' ? plan.input : null).not.toHaveProperty(
+      'style',
+    );
+  });
+
   it('builds spec generation plans with reference prompt semantics', () => {
     const plan = buildImageGenerationSubmissionPlan({
       dialog: {
@@ -294,6 +313,7 @@ describe('ImageCanvasGenerationSubmissionModel', () => {
         prompt: '  白发骑士  ',
         status: 'idle',
         imageModel: 'gpt-image-2',
+        style: 'pixelArt',
         aspectRatio: '2:3',
         imageSize: '2K',
         characterSpecReference: {
@@ -324,6 +344,7 @@ describe('ImageCanvasGenerationSubmissionModel', () => {
         model: 'gpt-image-2',
         screenColor: 'auto',
         segModel: 'birefnet',
+        style: 'pixelArt',
         aspectRatio: '2:3',
         imageSize: '2K',
         referenceImageSrcs: [
@@ -432,6 +453,7 @@ describe('ImageCanvasGenerationSubmissionModel', () => {
         mode: 'publication',
         prompt: '',
         status: 'idle',
+        style: 'pixelArt',
         publicationGameInfo: {
           gameName: ' 重庆洪崖洞火锅 ',
           gameCategories: '抓大鹅、休闲、治愈、手绘风',
@@ -665,6 +687,7 @@ describe('ImageCanvasGenerationSubmissionModel', () => {
       prompt: '  返回按钮  \n\n设置按钮',
       status: 'idle',
       imageModel: 'gpt-image-2',
+      style: 'pixelArt',
       aspectRatio: '3:2',
       imageSize: '2K',
       assetLabel: '  冒险游戏图标  ',
@@ -695,6 +718,7 @@ describe('ImageCanvasGenerationSubmissionModel', () => {
         model: 'gpt-image-2',
         screenColor: 'auto',
         segModel: 'birefnet',
+        style: 'pixelArt',
         aspectRatio: '3:2',
         imageSize: '2K',
       },