feat(platform): Agent 能力 - 扩展画布读取与模型路由能力

backend/internal/app/cloud_agent_canvas_state.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"strings"
 
+	"yingce/backend/internal/assets"
 	"yingce/backend/internal/canvas/capability"
 	"yingce/backend/internal/repository"
 )
@@ -453,6 +454,16 @@ func cloudAgentProjectNodeFields(node, meta map[string]any, descriptor capabilit
 		if !ok || (key == "content" && descriptor.GenerationMode != "") {
 			continue
 		}
+		// Some older uploads persist only a resource URL in the text node. Do not
+		// expose that locator as if it were the novel/script正文; the model must
+		// call canvas_read_text, which authorizes and reads the owned resource.
+		if key == "content" {
+			if text, isString := value.(string); isString && assets.ResourceID(text) != "" {
+				projected["contentAvailable"] = true
+				projected["contentSource"] = "resource"
+				continue
+			}
+		}
 		if safe, truncated := cloudAgentSafeProjection(value, textLimit); safe != nil {
 			projected[key] = safe
 			if truncated {