refactor(ai-pick): 主标签背景改用自建色bg_hotlist_orange，与CardHarmoyos/Vue一致

src/main/ets/ai-pick/AiPickNodeComponent.ets

@@ -659,7 +659,7 @@ export struct AiPickNodeComponent {
             .height(16)
             .textAlign(TextAlign.Center)
             .borderRadius(2)
-            .backgroundColor($r('app.color.elements_button_bg_tertiary'))
+            .backgroundColor($r('app.color.bg_hotlist_orange'))
         }
       }
       .width('35%')

src/main/resources/base/element/color.json

@@ -122,6 +122,10 @@
     {
       "name": "hotlist_purple",
       "value": "#b341d9"
+    },
+    {
+      "name": "bg_hotlist_orange",
+      "value": "#1AFF661A"
     }
   ]
 }