feat(admin): 首页卡片配置 + 页头开关验证 + 编辑按钮仅登录可见

- settings.sections：显隐 / 顺序 / 标题覆盖 / 预览条数，HomeView 应用
- /admin 新增「首页卡片」Tab，卡片标题使用展示块标题（常用站点等）
- 详情页 [编辑] 仅在登录后渲染（canEdit）
- 测试：46 passed；页头禁用、卡片隐藏/改标题/限条数、编辑可见性均实测
- 文档：ADMIN-PLAN、README

stash-web/src/settings.ts

@@ -12,6 +12,13 @@ export type HeaderItem = {
   tone: SettingsTone
 }
 
+export type SectionSettings = {
+  hidden: string[]
+  order: string[]
+  titles: Record<string, string>
+  limits: Record<string, number>
+}
+
 export type SiteSettings = {
   header: {
     enabled: boolean
@@ -23,6 +30,7 @@ export type SiteSettings = {
     hidden: string[]
     order: string[]
   }
+  sections: SectionSettings
 }
 
 export type SettingsDocument = {
@@ -53,6 +61,7 @@ export function defaultSettings(): SiteSettings {
       ],
     },
     sidebar: { hidden: [], order: [] },
+    sections: { hidden: [], order: [], titles: {}, limits: {} },
   }
 }
 
@@ -115,8 +124,43 @@ export function applySidebarSettings<T extends { id: string }>(
   categories: T[],
   sidebar: SiteSettings['sidebar'],
 ): T[] {
-  const hidden = new Set(sidebar.hidden)
-  const ranks = new Map(sidebar.order.map((id, index) => [id, index]))
+  return orderAndFilter(categories, sidebar)
+}
+
+/** 首页卡片：过滤隐藏、按 order 排序（未列出的保持原顺序） */
+export function applySectionSettings<T extends { id: string }>(
+  categories: T[],
+  sections: SectionSettings,
+): T[] {
+  return orderAndFilter(categories, sections)
+}
+
+/** 卡片标题：设置里的覆盖值优先 */
+export function sectionTitle(
+  id: string,
+  fallback: string,
+  sections: SectionSettings,
+): string {
+  const override = sections.titles[id]
+  return override !== undefined && override.trim() !== '' ? override : fallback
+}
+
+/** 卡片预览条数：设置里的覆盖值优先 */
+export function sectionLimit(
+  id: string,
+  fallback: number,
+  sections: SectionSettings,
+): number {
+  const override = sections.limits[id]
+  return typeof override === 'number' && override > 0 ? override : fallback
+}
+
+function orderAndFilter<T extends { id: string }>(
+  categories: T[],
+  config: { hidden: string[]; order: string[] },
+): T[] {
+  const hidden = new Set(config.hidden)
+  const ranks = new Map(config.order.map((id, index) => [id, index]))
 
   return categories
     .filter((category) => !hidden.has(category.id))