feat: add model role badges and reorder presets to prioritize Opus

- Add Primary/Fallback badge to each model card in OpenClaw form
- Update modelsHint to explain model ordering semantics
- Reorder 11 aggregator/third-party presets to put Opus first

src/components/providers/forms/OpenClawFormFields.tsx

@@ -236,6 +236,24 @@ export function OpenClawFormFields({
                 key={modelKeys[index]}
                 className="p-3 border border-border/50 rounded-lg space-y-3"
               >
+                {/* Role badge */}
+                <div className="flex items-center">
+                  <span
+                    className={`text-[10px] font-medium px-1.5 py-0.5 rounded ${
+                      index === 0
+                        ? "bg-blue-500/15 text-blue-600 dark:text-blue-400"
+                        : "bg-muted text-muted-foreground"
+                    }`}
+                  >
+                    {index === 0
+                      ? t("openclaw.primaryModel", {
+                          defaultValue: "默认模型",
+                        })
+                      : t("openclaw.fallbackModel", {
+                          defaultValue: "回退模型",
+                        })}
+                  </span>
+                </div>
                 {/* Model ID and Name row */}
                 <div className="flex items-center gap-2">
                   <div className="flex-1 space-y-1">
@@ -463,7 +481,7 @@ export function OpenClawFormFields({
         <p className="text-xs text-muted-foreground">
           {t("openclaw.modelsHint", {
             defaultValue:
-              "配置该供应商支持的模型。模型 ID 用于 API 调用，显示名称用于界面展示。",
+              "配置该供应商支持的模型。第一个模型为默认模型（Primary），其余为回退模型（Fallback）。拖拽或调整顺序可更改默认模型。",
           })}
         </p>
       </div>