feat(B1): 校级建站入口-新建院系子站(向导锁定本校主站)+学校信息服务端继承

- SiteManage: 新建按钮校级显示"新建院系子站";编辑弹窗校级隐藏schId/schName(payload留空服务端继承)
- SiteWizard: lockParentId 锁定上级为本校主站禁改
- SchoolWorkbench: 副文案改自助创建口径
- vitest 24/24 绿 + build 成功

src/views/cms/SiteWizard.vue

@@ -17,6 +17,8 @@ import SiteConfigForm from "@/views/cms/components/SiteConfigForm.vue";
 const props = defineProps<{
     visible: boolean;
     sites: SiteVo[];
+    /** B1 建站权限拆分：校级锁定在本校主站下建院系子站（上级禁改、学校信息由服务端继承） */
+    lockParentId?: number;
 }>();
 
 const emit = defineEmits<{
@@ -51,7 +53,12 @@ const canPreview = computed(() => !!sourceSiteCode.value && !!themeName.value);
 const previewTick = ref(0);
 const previewParams = ref<FormModelValue>({});
 
-const parentOptions = computed(() => props.sites.filter(s => !s.parentSiteId));
+/** 锁定模式：上级仅本校主站；否则全部顶层站可选 */
+const parentOptions = computed(() =>
+    props.lockParentId
+        ? props.sites.filter(s => s.id === props.lockParentId && !s.parentSiteId)
+        : props.sites.filter(s => !s.parentSiteId)
+);
 
 function debouncePreview() {
     previewParams.value = { ...themeParams.value };
@@ -71,7 +78,7 @@ watch(
     async v => {
         if (!v) return;
         step.value = 1;
-        Object.assign(form, { code: "", parentSiteId: undefined, schId: undefined, schName: "", name: "", status: 1, configJson: "" });
+        Object.assign(form, { code: "", parentSiteId: props.lockParentId, schId: undefined, schName: "", name: "", status: 1, configJson: "" });
         sourceSiteCode.value = sourceSites.value[0]?.code || "";
         if (!themes.value.length) await loadThemes();
         themeName.value = "default";
@@ -128,8 +135,9 @@ async function createSite() {
             .save({
                 code: form.code,
                 parentSiteId: form.parentSiteId || 0,
-                schId: form.schId,
-                schName: form.schName || undefined,
+                // B1：校级锁定模式学校信息留空，服务端校验后继承主站（防伪造）
+                schId: props.lockParentId ? undefined : form.schId,
+                schName: props.lockParentId ? undefined : form.schName || undefined,
                 name: form.name,
                 theme: themeName.value,
                 configJson,
@@ -148,7 +156,7 @@ async function createSite() {
 <template>
     <Modal
         :model-value="visible"
-        :title="`新建站点向导 · 第 ${step} / 3 步`"
+        :title="`${props.lockParentId ? '新建院系子站' : '新建站点'}向导 · 第 ${step} / 3 步`"
         :mask-closable="false"
         width="980px"
         @update:model-value="emit('update:visible', $event)"
@@ -200,18 +208,19 @@ async function createSite() {
                         <Input v-model="form.name" :maxlength="128" placeholder="如 XX学校门户网站" style="width: 320px" />
                     </FormItem>
                     <FormItem label="上级站点">
-                        <Select v-model="form.parentSiteId" clearable placeholder="空=顶层校站点；选主站则为院系子站" style="width: 320px">
+                        <Select v-model="form.parentSiteId" :disabled="!!props.lockParentId" placeholder="空=顶层校站点；选主站则为院系子站" style="width: 320px">
                             <Option v-for="s in parentOptions" :key="s.id" :value="s.id">{{ s.name }}（{{ s.code }}）</Option>
                         </Select>
+                        <div v-if="props.lockParentId" class="pbu-tip">校级角色仅可在本校主站下创建院系子站，学校信息自动继承主站。</div>
                     </FormItem>
-                    <FormItem label="学校ID">
+                    <FormItem v-if="!props.lockParentId" label="学校ID">
                         <InputNumber v-model="form.schId" :min="1" placeholder="UserBase sys_group.id" style="width: 200px" />
                         <!-- B-8：顶层站 schId 必填（校级角色按此匹配管理权限）；院系子站留空自动继承主站 -->
                         <div class="pbu-tip">
                             顶层站点必填（否则建成即校级角色不可管理）；选了上级站点的院系子站可留空，自动继承主站。
                         </div>
                     </FormItem>
-                    <FormItem label="学校名称">
+                    <FormItem v-if="!props.lockParentId" label="学校名称">
                         <Input v-model="form.schName" :maxlength="128" style="width: 320px" />
                     </FormItem>
                     <FormItem label="状态">