feat(web): 新增媒体库和轮播图 API client

媒体库（media.ts）：文件列表/上传/更新/删除/移动/批量删除/裁剪 + 文件夹树形管理
轮播图（banners.ts）：列表/创建/更新/删除/排序，字段与后端 DTO 完全对齐

apps/web/src/api/health/banners.ts

@@ -0,0 +1,107 @@
+import client from '../client';
+
+// ---------------------------------------------------------------------------
+// 轮播图类型
+// ---------------------------------------------------------------------------
+
+export interface BannerItem {
+  id: string;
+  tenant_id: string;
+  media_item_id: string;
+  title?: string;
+  subtitle?: string;
+  link_type?: string;
+  link_target?: string;
+  sort_order: number;
+  status: string;
+  start_time?: string;
+  end_time?: string;
+  image_url?: string;
+  thumbnail_url?: string;
+  media_deleted: boolean;
+  created_at: string;
+  updated_at: string;
+  created_by?: string;
+  updated_by?: string;
+  version: number;
+}
+
+export interface CreateBannerReq {
+  media_item_id: string;
+  title?: string;
+  subtitle?: string;
+  link_type?: string;
+  link_target?: string;
+  sort_order?: number;
+  status?: string;
+  start_time?: string;
+  end_time?: string;
+}
+
+export interface UpdateBannerReq {
+  media_item_id?: string;
+  title?: string;
+  subtitle?: string;
+  link_type?: string;
+  link_target?: string;
+  sort_order?: number;
+  status?: string;
+  start_time?: string;
+  end_time?: string;
+  version: number;
+}
+
+export interface SortBannerReq {
+  items: Array<{ id: string; sort_order: number }>;
+}
+
+// ---------------------------------------------------------------------------
+// 轮播图 API
+// ---------------------------------------------------------------------------
+
+export const bannerApi = {
+  /** 获取轮播图列表（可按状态筛选） */
+  list: async (status?: string) => {
+    const { data } = await client.get<{
+      success: boolean;
+      data: BannerItem[];
+    }>('/health/banners', { params: status ? { status } : undefined });
+    return data.data;
+  },
+
+  /** 创建轮播图 */
+  create: async (req: CreateBannerReq) => {
+    const { data } = await client.post<{
+      success: boolean;
+      data: BannerItem;
+    }>('/health/banners', req);
+    return data.data;
+  },
+
+  /** 更新轮播图 */
+  update: async (id: string, req: UpdateBannerReq) => {
+    const { data } = await client.put<{
+      success: boolean;
+      data: BannerItem;
+    }>(`/health/banners/${id}`, req);
+    return data.data;
+  },
+
+  /** 删除轮播图 */
+  delete: async (id: string, version: number) => {
+    const { data } = await client.delete<{
+      success: boolean;
+      data: null;
+    }>(`/health/banners/${id}`, { data: { version } });
+    return data.data;
+  },
+
+  /** 轮播图排序 */
+  sort: async (req: SortBannerReq) => {
+    const { data } = await client.put<{
+      success: boolean;
+      data: null;
+    }>('/health/banners/sort', req);
+    return data.data;
+  },
+};