feat: 新增公告功能及外卖备注工具

新增公告功能接口及页面，支持查看最新公告信息
添加外卖备注工具，可管理常用备注并一键生成
优化动态筛选接口，支持多分类和标签组合筛选
移除flutter_dotenv依赖，不再使用.env文件
修复布局溢出错误处理逻辑，避免生产环境报错
新增文件选择器插件，替换receive_sharing_intent实现文件导入

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -7,6 +7,8 @@ import Foundation
 
 import connectivity_plus
 import device_info_plus
+import file_picker_ohos
+import file_selector_macos
 import package_info_plus
 import path_provider_foundation
 import share_plus
@@ -17,6 +19,8 @@ import url_launcher_macos
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   ConnectivityPlugin.register(with: registry.registrar(forPlugin: "ConnectivityPlugin"))
   DeviceInfoPlusMacosPlugin.register(with: registry.registrar(forPlugin: "DeviceInfoPlusMacosPlugin"))
+  FilePickerPlugin.register(with: registry.registrar(forPlugin: "FilePickerPlugin"))
+  FileSelectorPlugin.register(with: registry.registrar(forPlugin: "FileSelectorPlugin"))
   FPPPackageInfoPlusPlugin.register(with: registry.registrar(forPlugin: "FPPPackageInfoPlusPlugin"))
   PathProviderPlugin.register(with: registry.registrar(forPlugin: "PathProviderPlugin"))
   SharePlusMacosPlugin.register(with: registry.registrar(forPlugin: "SharePlusMacosPlugin"))