fix(canvas): 局部重绘、图片规格与任务参数修复

backend/internal/service/model_capability.go

@@ -822,10 +822,11 @@ func validateImageTask(profile *ImageCapabilityConfig, input canvasGenerationInp
 			return BadAuthRequest(err.Error())
 		}
 	}
-	if profile.Quality.Supported && strings.TrimSpace(input.Config.Quality) != "" && !containsCapabilityString(profile.Quality.Values, input.Config.Quality) {
+	quality := strings.TrimSpace(input.Config.Quality)
+	if profile.Quality.Supported && quality != "" && !strings.EqualFold(quality, "auto") && !strings.EqualFold(quality, "any") && !containsCapabilityString(profile.Quality.Values, quality) {
 		return BadAuthRequest("图片质量不在当前模型支持范围内")
 	}
-	if err := validateImagePresetSelection(profile, firstNonEmpty(input.Config.Quality, profile.Quality.Default), firstNonEmpty(input.Config.Size, profile.Size.Default)); err != nil {
+	if err := validateImagePresetSelection(profile, qualityForImageValidation(quality, profile.Quality.Default), firstNonEmpty(input.Config.Size, profile.Size.Default)); err != nil {
 		return err
 	}
 	count, err := strconv.Atoi(strings.TrimSpace(input.Config.Count))
@@ -835,6 +836,13 @@ func validateImageTask(profile *ImageCapabilityConfig, input canvasGenerationInp
 	return nil
 }
 
+func qualityForImageValidation(quality string, fallback string) string {
+	if strings.EqualFold(quality, "auto") || strings.EqualFold(quality, "any") {
+		return fallback
+	}
+	return firstNonEmpty(quality, fallback)
+}
+
 func validateImagePresetSelection(profile *ImageCapabilityConfig, quality, ratio string) error {
 	if profile.Size.Parameter != "aspect_ratio" || profile.Size.AllowCustom || len(profile.Size.Presets) == 0 || ratio == "auto" {
 		return nil

backend/internal/service/model_router.go

@@ -65,6 +65,13 @@ func ModelRequestIntentFromTaskInput(input map[string]any, taskType string, oper
 		explicitOptions = true
 		for key, value := range options {
 			name := canonicalCapabilityOptionName(key)
+			// auto/any 表示调用方不指定质量；不能把它当作模型必须声明的
+			// 枚举值，否则未列出 auto 的模型会被错误判定为参数不支持。
+			if name == "quality" {
+				if normalized, ok := value.(string); ok && (strings.EqualFold(strings.TrimSpace(normalized), "auto") || strings.EqualFold(strings.TrimSpace(normalized), "any")) {
+					continue
+				}
+			}
 			intent.Options[name] = normalizeModelRequestOption(name, value)
 		}
 	}

backend/internal/service/model_router_test.go

@@ -38,6 +38,19 @@ func TestImagePriceTiersMatchResolutionAndActualReferences(t *testing.T) {
 	}
 }
 
+func TestAutoQualityIsOmittedFromCapabilityIntent(t *testing.T) {
+	intent := ModelRequestIntentFromTaskInput(map[string]any{
+		"mode":              "image",
+		"capabilityOptions": map[string]any{"quality": "auto", "size": "2048x878"},
+	}, "canvas_image", "image")
+	if _, exists := intent.Options["quality"]; exists {
+		t.Fatalf("quality option = %#v, want omitted for auto", intent.Options["quality"])
+	}
+	if intent.Options["size"] != "2048x878" {
+		t.Fatalf("size option = %#v, want preserved", intent.Options["size"])
+	}
+}
+
 func TestModelRequestIntentNormalizesVideoResolution(t *testing.T) {
 	input := map[string]any{
 		"mode":   "video",