fix: remove hardcoded dark theme colors from index.ui

- Remove bgcolor/color/border hardcoded dark theme values
- Use css:'card' class for navigation card
- Let system theme handle styling for proper contrast

wwwroot/index.ui

@@ -3,8 +3,7 @@
     "options": {
         "width": "100%",
         "height": "100%",
-        "padding": "0",
+        "padding": "0"
-        "bgcolor": "#0B1120"
     },
     "subwidgets": [
         {
@@ -19,7 +18,6 @@
                     "widgettype": "Title2",
                     "options": {
                         "text": "定价管理",
-                        "color": "#F1F5F9",
                         "fontWeight": "700"
                     }
                 },
@@ -30,8 +28,7 @@
                     "widgettype": "Text",
                     "options": {
                         "text": "模型定价项目与计费规则配置",
-                        "fontSize": "14px",
+                        "fontSize": "14px"
-                        "color": "#64748B"
                     }
                 }
             ]
@@ -39,10 +36,8 @@
         {
             "widgettype": "VBox",
             "options": {
-                "bgcolor": "#1E293B",
+                "css": "card",
                 "padding": "24px",
-                "borderRadius": "12px",
-                "border": "1px solid #334155",
                 "cursor": "pointer"
             },
             "binds": [
@@ -58,20 +53,10 @@
                 }
             ],
             "subwidgets": [
-                {
-                    "widgettype": "Svg",
-                    "options": {
-                        "svg": "<svg width=\"36\" height=\"36\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#F59E0B\" stroke-width=\"1.5\"><path d=\"M12 6v12m-3-2.818l.879.659c1.171.879 3.07.879 4.242 0 1.172-.879 1.172-2.303 0-3.182C13.536 12.219 12.768 12 12 12c-.725 0-1.45-.22-2.003-.659-1.106-.879-1.106-2.303 0-3.182s2.9-.879 4.006 0l.415.33M21 12a9 9 0 11-18 0 9 9 0 0118 0z\"/></svg>",
-                        "width": "36px",
-                        "height": "36px",
-                        "marginBottom": "16px"
-                    }
-                },
                 {
                     "widgettype": "Title4",
                     "options": {
                         "text": "定价项目管理",
-                        "color": "#F1F5F9",
                         "fontWeight": "600",
                         "marginBottom": "8px"
                     }
@@ -80,8 +65,7 @@
                     "widgettype": "Text",
                     "options": {
                         "text": "管理模型定价规则、计费项目和定时任务",
-                        "fontSize": "14px",
+                        "fontSize": "14px"
-                        "color": "#94A3B8"
                     }
                 }
             ]