chore: 初始化uniapp前端项目基础框架

新增项目配置、静态资源、工具类、状态管理、API接口、组件库集成等全套基础代码，完成项目初始化搭建

frontend/app/src/api/module_example/demo.ts

@@ -0,0 +1,86 @@
+/**
+ * 示例 API 模块（对应后端 module_example 插件）
+ */
+import { http } from '@/http'
+
+const DEMO_BASE = '/example/demo'
+
+export const DemoAPI = {
+  /** 示例分页列表 */
+  getPage(query?: DemoPageQuery): Promise<PageResult<DemoTable>> {
+    return http.Get(`${DEMO_BASE}/list`, query)
+  },
+  /** 示例详情 */
+  getDetail(id: number): Promise<DemoTable> {
+    return http.Get(`${DEMO_BASE}/detail/${id}`)
+  },
+  /** 创建示例 */
+  create(data: DemoForm): Promise<void> {
+    return http.Post(`${DEMO_BASE}/create`, data)
+  },
+  /** 更新示例 */
+  update(id: number, data: DemoForm): Promise<void> {
+    return http.Put(`${DEMO_BASE}/update/${id}`, data)
+  },
+  /** 删除示例 */
+  remove(ids: number[]): Promise<void> {
+    return http.Delete(`${DEMO_BASE}/delete`, { ids: JSON.stringify(ids) })
+  },
+  /** 批量设置示例状态 */
+  batchStatus(data: BatchType): Promise<void> {
+    return http.Patch(`${DEMO_BASE}/status/batch`, data)
+  },
+  /** 导出示例 */
+  exportDemo(query?: DemoPageQuery): Promise<unknown> {
+    return http.Post(`${DEMO_BASE}/export`, query)
+  },
+  /** 下载导入模板 */
+  downloadTemplate(): Promise<unknown> {
+    return http.Post(`${DEMO_BASE}/download/template`)
+  },
+  /** 导入示例数据 */
+  importDemo(body: Record<string, any>): Promise<void> {
+    return http.Post(`${DEMO_BASE}/import`, body, {
+      headers: { 'Content-Type': 'multipart/form-data' },
+    })
+  },
+}
+
+/* ==================== 类型定义 ==================== */
+
+export interface DemoPageQuery extends PageQuery {
+  name?: string
+  status?: number
+}
+
+export interface DemoTable {
+  id?: number
+  name?: string
+  status?: number
+  description?: string
+  int_val?: number
+  bigint_val?: number
+  float_val?: number
+  bool_val?: boolean
+  date_val?: string
+  time_val?: string
+  datetime_val?: string
+  text_val?: string
+  json_val?: Record<string, any>
+}
+
+export interface DemoForm {
+  id?: number
+  name?: string
+  status?: number
+  description?: string
+  int_val?: number
+  bigint_val?: number
+  float_val?: number
+  bool_val?: boolean
+  date_val?: string
+  time_val?: Date | string
+  datetime_val?: Date | string
+  text_val?: string
+  json_val?: Record<string, any>
+}