修复图标规范参考图超限预检

后端在调用 LLM 前按模型上限拒绝超限参考图。
前端在请求发送前限制图标规范参考图数量。
补充超限零请求回归测试与预检顺序断言。

src/services/image-editor/editorProjectClient.test.ts

@@ -1452,6 +1452,20 @@ describe('editorProjectClient', () => {
     expect(requestJsonMock).not.toHaveBeenCalled();
   });
 
+  it('rejects excess icon spec references before dispatch', async () => {
+    await expect(
+      generateEditorIconSpec({
+        playSetting: '回合制占点',
+        artStyle: '低多边形',
+        referenceImageSrcs: Array.from(
+          { length: 6 },
+          (_, index) => `resource-reference-${index + 1}`,
+        ),
+      }),
+    ).rejects.toThrow('图标规范参考图最多允许 5 张，当前选择 6 张');
+    expect(requestJsonMock).not.toHaveBeenCalled();
+  });
+
   it('submits icon spec business fields without a client prompt or image kind', async () => {
     requestJsonMock.mockResolvedValueOnce({
       imageSrc: 'data:image/png;base64,spec',

src/services/image-editor/editorProjectClient.ts

@@ -1106,6 +1106,11 @@ export async function generateEditorIconSpec(
     '美术风格',
   );
   assertStableEditorMediaReferences(input.referenceImageSrcs, '图标规范参考图');
+  assertEditorReferenceLimit(
+    input.referenceImageSrcs,
+    EDITOR_IMAGE_REFERENCE_LIMIT,
+    '图标规范参考图',
+  );
   return requestJson<EditorImageGenerationResponse>(
     EDITOR_ICON_SPEC_GENERATION_API,
     jsonRequest('POST', {