Unify ComfyUI ingress model ID and fix seed validation errors.

Merge model_id/alias in the image provider UI, and ensure ComfyUI never receives seed -1 after cloneMap type coercion.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/handler/admin/providers_keys.go

@@ -275,6 +275,9 @@ func (h *Handler) CreateModel(c *gin.Context) {
 		VersionHash:      prediction.HashWorkflowJSON(req.WorkflowJSON),
 		Enabled:          true,
 	}
+	if prov.Category == model.CategoryImage {
+		m.Alias = ""
+	}
 	if m.DisplayName == "" {
 		m.DisplayName = req.ModelID
 	}
@@ -347,6 +350,9 @@ func (h *Handler) UpdateModel(c *gin.Context) {
 		m.InputBindingJSON = string(b)
 	}
 	prov, _ := h.cache.GetProvider(m.ProviderID)
+	if prov.Category == model.CategoryImage {
+		m.Alias = ""
+	}
 	if prov.Category == model.CategoryImage && m.WorkflowJSON != "" {
 		if err := validateImageModelCreate(struct {
 			ModelID, DisplayName string