feat(agent): 批量创作表 - 注册节点能力与读写工具

backend/internal/canvas/capability/builtin.go

@@ -50,6 +50,34 @@ func BuiltinRegistry() *Registry {
 				return map[string]any{"frame": map[string]any{"collapsed": false, "expandedWidth": float64(760), "expandedHeight": float64(520)}}
 			},
 		},
+		{
+			Type: "batch-table", Version: "1", Label: "批量创作表", DefaultWidth: 900, DefaultHeight: 520,
+			Purpose:     "面向电商批量换装和创意生图的结构化任务表；每行绑定最多六组画布图片、可用 @参考图1 等位置引用编写独立提示词，并追踪生成结果。",
+			GoodFor:     []string{"商品与模特批量换装", "同一商品多场景创意图", "多组参考图组合生成", "批量结果追踪与失败重试"},
+			NotIdealFor: []string{"通用数据库或库存管理", "单张图片快速试验", "多镜头叙事连续性"},
+			Tradeoffs:   []string{"参考图必须先作为图片节点进入画布", "批量提交会产生多项生成任务，执行前必须确认模型、数量和费用"},
+			Actions:     []string{"read_rows", "append_row", "update_row", "remove_row", "set_operation", "set_concurrency", "add_reference_column", "preview_batch_generation"},
+			InputKind:   "text",
+			Connection:  ConnectionPolicy{CanSource: true, CanTarget: true, AcceptedInputKinds: []string{"image"}},
+			CanUpdate:   true, SummaryFields: []string{"batchTable"}, DetailFields: []string{"batchTable"}, ProjectionKind: "batch_table", ProjectionField: "batchTable",
+			PatchFields: map[string]PatchField{
+				"title": {Path: "title", Kind: patchKindString, Label: "节点名称", Order: 10, Description: "批量创作表标题", MaxRunes: maxAgentNodeTitleRunes},
+			},
+			CreateMetadata: func(string) map[string]any {
+				return map[string]any{
+					"status": "idle",
+					"batchTable": map[string]any{
+						"operation": "try_on", "concurrency": float64(10),
+						"referenceColumns": []any{
+							map[string]any{"id": "reference-1", "label": "参考图 1"},
+							map[string]any{"id": "reference-2", "label": "参考图 2"},
+							map[string]any{"id": "reference-3", "label": "参考图 3"},
+						},
+						"rows": []any{},
+					},
+				}
+			},
+		},
 		{
 			Type: "script", Version: "1", Label: "分镜脚本", DefaultWidth: 920, DefaultHeight: 360,
 			Purpose:       "维护结构化的多镜头脚本，支持镜头级审查、修改和媒体关联。",

backend/internal/canvas/capability/descriptor.go

@@ -143,7 +143,7 @@ func (d Descriptor) ApplyPatch(node map[string]any, patch map[string]any) error
 }
 
 func (d Descriptor) ValidateConnection(fromKind string) error {
-	if !d.Connection.CanTarget || d.GenerationMode == "" {
+	if !d.Connection.CanTarget {
 		return fmt.Errorf("%s 节点不能接收参考输入", d.Label)
 	}
 	if !d.AllowsInput(fromKind) {