feat(*): 创作配置 - 支持 Midjourney、多图保存与自定义公告

Co-authored-by: ddcat666 <26564566+ddcat666@users.noreply.github.com>

web/src/types/canvas.ts

@@ -390,6 +390,7 @@ export type CanvasNodeMetadata = {
     taskCreatedAt?: string;
     taskUpdatedAt?: string;
     generationEffectKeys?: string[];
+    generationOutputCount?: number;
     agentGenerationContinuation?: {
         id: string;
         taskId: string;