feat(content): 分组对所有内容类型生效，统一分区/分组/条目模型

- 分区=容器，分组=任意类型的可选子容器，条目可挂分区或分组（直属分区）
- catalog 所有类型统一输出 groups + items，条目查询按节点取
- 详情/侧栏/首页卡片预览支持所有类型的分组；多组显示小标题 + 未分组
- 后台「分区」「侧栏导航」对所有类型可建组；「内容」弹窗分组可选直属分区，编辑可换组
- 修复首页卡片配置为「整个分区」时预览为空
- 测试 59 passed

stash-web/src/settings.ts

@@ -175,30 +175,42 @@ export function applySidebarGroups(
   categories: Category[],
   sidebar: SiteSettings['sidebar'],
 ): Category[] {
+  return categories.map((category) => {
+    if (category.kind === 'apps') {
+      return { ...category, groups: filterGroups(category.groups, category.id, sidebar) }
+    }
+    if (category.kind === 'posters') {
+      return { ...category, groups: filterGroups(category.groups, category.id, sidebar) }
+    }
+    return { ...category, groups: filterGroups(category.groups, category.id, sidebar) }
+  })
+}
+
+/** 按设置过滤、排序某个分区下的分组 */
+function filterGroups<T extends { id: string }>(
+  groups: T[],
+  categoryId: string,
+  sidebar: SiteSettings['sidebar'],
+): T[] {
   const hidden = new Set(sidebar.hidden_groups)
   const shown = new Set(sidebar.shown_groups)
+  const ranks = new Map(
+    (sidebar.group_order[categoryId] ?? []).map((id, index) => [id, index] as const),
+  )
 
-  return categories.map((category) => {
-    if (category.kind !== 'apps') return category
-
-    const ranks = new Map(
-      (sidebar.group_order[category.id] ?? []).map((id, index) => [id, index] as const),
-    )
-    const groups = category.groups
-      .filter((group) => {
-        const key = `${category.id}/${group.id}`
-        return !hidden.has(key) && (group.showInSidebar !== false || shown.has(key))
-      })
-      .map((group, index) => ({
-        group,
-        index,
-        rank: ranks.get(group.id) ?? Number.MAX_SAFE_INTEGER,
-      }))
-      .sort((a, b) => (a.rank === b.rank ? a.index - b.index : a.rank - b.rank))
-      .map((entry) => entry.group)
-
-    return { ...category, groups }
-  })
+  return groups
+    .filter((group) => {
+      const key = `${categoryId}/${group.id}`
+      const showInSidebar = (group as { showInSidebar?: boolean }).showInSidebar
+      return !hidden.has(key) && (showInSidebar !== false || shown.has(key))
+    })
+    .map((group, index) => ({
+      group,
+      index,
+      rank: ranks.get(group.id) ?? Number.MAX_SAFE_INTEGER,
+    }))
+    .sort((a, b) => (a.rank === b.rank ? a.index - b.index : a.rank - b.rank))
+    .map((entry) => entry.group)
 }
 
 /** 卡片标题：设置里的覆盖值优先 */