feat(appicon): 应用图标 AppIcon 矢量选择器接入（YschAppIcons 资产库 10-04 轮）

- src/assets/appicon-icons.json：资产库图标清单
- src/components/AppIconPicker.vue：矢量图标+配色选择器（YschAppIcons mask 资产）
- AppForm.vue：平台模式 Pc 应用图标换 AppIconPicker（学校模式保留位图上传，学校覆盖线只收 pcIcon）；App 位图图标移入高级折叠区（遗留通道，存量 pc_icon/app_icon 链路保留，新应用优先矢量图标键）
- AddAppContainer/EditAppContainer：配套接线
依据：根目录《AppIcon资产库落地-执行报告-20261004.md》P2 管理端图标选择器

src/views/app/AddAppContainer.vue

@@ -22,7 +22,7 @@ let onSuccessCallback: (() => void) | null = null;
 // useForm 托管提交
 const { form, loading: submitting, send: sendForm, onSuccess, onError } = useForm(
     (dto) => Apis.AppSettings.addApp({ data: dto }),
-    { initialForm: { name: '', categoryId: undefined, desc: '', appCode: '', appNature: 'BUSINESS', clients: [], pcUrl: '', pcIcon: '', appUrl: '', appIcon: '', officialAccountUrl: '', dingtalkUrl: '' }, resetAfterSubmiting: true }
+    { initialForm: { name: '', categoryId: undefined, desc: '', appCode: '', appNature: 'BUSINESS', clients: [], pcUrl: '', pcIcon: '', appUrl: '', appIcon: '', iconKey: '', iconColor: '', officialAccountUrl: '', dingtalkUrl: '' }, resetAfterSubmiting: true }
 );
 
 onSuccess(() => {
@@ -57,6 +57,8 @@ async function handleSubmit(formData: Record<string, any>) {
         pcIcon: formData.pcIcon,
         appUrl: formData.appUrl,
         appIcon: formData.appIcon,
+        iconKey: formData.iconKey,
+        iconColor: formData.iconColor,
         officialAccountUrl: formData.officialAccountUrl,
         dingtalkUrl: formData.dingtalkUrl,
     };