Align console behavior with operator routing and image workflow expectations

Constraint: Must preserve current exchange-rate logic, same-group routing boundary, and temporary image-file behavior while fixing UX-visible inconsistencies.
Rejected: Large frontend chunk refactor | introduced risky circular chunking and did not improve deliverability for this rollout.
Confidence: medium
Scope-risk: moderate
Directive: Keep channel failover constrained to the selected group and preserve Beijing-day semantics for user cache dashboard metrics.
Tested: go test ./controller ./model ./service ./common -count=1; npm run build; remote smoke on source deployment at http://38.76.218.56:18081/ plus /api/status and /api/image-studio/settings.
Not-tested: Browser-driven end-to-end verification of every console page interaction.

controller/option.go

@@ -89,6 +89,32 @@ func GetOptions(c *gin.Context) {
 		Key:   "CompletionRatioMeta",
 		Value: buildCompletionRatioMetaValue(optionValues),
 	})
+	pricingItems := model.GetPricing()
+	imageStudioModels := make([]string, 0)
+	seenImageStudioModels := make(map[string]struct{})
+	for _, item := range pricingItems {
+		enabledForImage := false
+		for _, group := range item.EnableGroup {
+			if strings.TrimSpace(group) == "image" {
+				enabledForImage = true
+				break
+			}
+		}
+		if !enabledForImage {
+			continue
+		}
+		if _, ok := seenImageStudioModels[item.ModelName]; ok {
+			continue
+		}
+		seenImageStudioModels[item.ModelName] = struct{}{}
+		imageStudioModels = append(imageStudioModels, item.ModelName)
+	}
+	if encoded, err := common.Marshal(imageStudioModels); err == nil {
+		options = append(options, &model.Option{
+			Key:   "ImageStudioAvailableModels",
+			Value: string(encoded),
+		})
+	}
 	c.JSON(http.StatusOK, gin.H{
 		"success": true,
 		"message": "",