fix(image): 图片生成 - 打通分辨率选择并补充回归测试

backend/internal/workbench/service_test.go

@@ -158,7 +158,7 @@ func TestWorkbenchTaskRejectsUnknownParametersAndClientConfig(t *testing.T) {
 
 func TestWorkbenchTaskCanBeCreatedWithoutTool(t *testing.T) {
 	s, _, _ := newWorkbenchTest(t)
-	request := TaskInput{Kind: KindImage, Prompt: "A glass greenhouse at sunrise", Model: "image-model", LogicalModelID: "logical", Parameters: map[string]any{"size": "1024x1024", "count": 1}}
+	request := TaskInput{Kind: KindImage, Prompt: "A glass greenhouse at sunrise", Model: "image-model", LogicalModelID: "logical", Parameters: map[string]any{"size": "1024x1024", "imageResolution": "2k", "count": 1}}
 	resolved, err := s.ResolveTask("user", request)
 	if err != nil {
 		t.Fatal(err)
@@ -174,7 +174,8 @@ func TestWorkbenchTaskCanBeCreatedWithoutTool(t *testing.T) {
 		t.Fatalf("tool-less task contains a tool id: %#v", metadata)
 	}
 	snapshot := metadata["workbench"].(map[string]any)
-	if snapshot["kind"] != KindImage || snapshot["parameters"].(map[string]any)["count"] != 1 {
+	parameters := snapshot["parameters"].(map[string]any)
+	if snapshot["kind"] != KindImage || parameters["count"] != 1 || parameters["imageResolution"] != "2k" {
 		t.Fatalf("workbench parameters not snapshotted: %#v", snapshot)
 	}
 	if resolved.TaskType != "canvas_image" || resolved.Operation != "image" {

backend/internal/workbench/tasks.go

@@ -194,7 +194,7 @@ func (s *Service) ResolveTask(userID string, req TaskInput) (*TaskResolution, er
 
 func normalizeTaskParameters(kind string, params map[string]any) (map[string]any, error) {
 	allowed := map[string]map[string]bool{
-		KindImage: {"size": true, "quality": true, "count": true},
+		KindImage: {"size": true, "quality": true, "imageResolution": true, "count": true},
 		KindVideo: {"seconds": true, "ratio": true, "resolution": true, "generateAudio": true, "watermark": true},
 	}[kind]
 	if allowed == nil {
@@ -206,7 +206,7 @@ func normalizeTaskParameters(kind string, params map[string]any) (map[string]any
 			return nil, kernel.BadAuthRequest("生成参数包含不支持字段: " + key)
 		}
 		switch key {
-		case "size", "quality", "ratio", "resolution":
+		case "size", "quality", "imageResolution", "ratio", "resolution":
 			text, ok := value.(string)
 			text = strings.TrimSpace(text)
 			if !ok || len(text) > 64 || strings.Contains(text, "://") || strings.HasPrefix(strings.ToLower(text), "data:") {