文档修改

frontend-web/src/open-canvas/api/ai-writing.ts

@@ -21,6 +21,7 @@ export async function startWritingSession(req: AIWritingRequest): Promise<string
       target_audience: req.targetAudience,
       word_count_target: req.wordCountTarget,
       model_name: req.modelName ?? '',
+      keyword_count: req.keywordCount,
     }),
   });
   if (!resp.ok) throw new Error(`启动失败: ${resp.status}`);