refactor(coach): 重构教练组件，统一导入并简化UI实现与类型定义

components/coach/types.ts

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+export type Role = 'user' | 'assistant';
+
+// 附件类型枚举
+export type AttachmentType = 'image' | 'video' | 'file';
+
+// 附件数据结构
+export type MessageAttachment = {
+  id: string;
+  type: AttachmentType;
+  url: string;
+  localUri?: string;  // 本地URI，用于上传中的显示
+  filename?: string;
+  size?: number;
+  duration?: number;  // 视频时长（秒）
+  thumbnail?: string; // 视频缩略图
+  width?: number;
+  height?: number;
+  uploadProgress?: number; // 上传进度 0-1
+  uploadError?: string;    // 上传错误信息
+};
+
+// AI选择选项数据结构
+export type AiChoiceOption = {
+  id: string;
+  label: string;
+  value: any;
+  recommended?: boolean;
+  emoji?: string;
+};
+
+// AI响应数据结构
+export type AiResponseData = {
+  content: string;
+  choices?: AiChoiceOption[];
+  interactionType?: 'text' | 'food_confirmation' | 'selection';
+  pendingData?: any;
+  context?: any;
+};
+
+// 重构后的消息数据结构
+export type ChatMessage = {
+  id: string;
+  role: Role;
+  content: string;           // 文本内容
+  attachments?: MessageAttachment[]; // 附件列表
+  choices?: AiChoiceOption[]; // 选择选项（仅用于assistant消息）
+  interactionType?: string;   // 交互类型
+  pendingData?: any;         // 待确认数据
+  context?: any;             // 上下文信息
+};
+
+// 卡片类型常量定义
+export const CardType = {
+  WEIGHT_INPUT: '__WEIGHT_INPUT_CARD__',
+  DIET_INPUT: '__DIET_INPUT_CARD__',
+  DIET_TEXT_INPUT: '__DIET_TEXT_INPUT__',
+  DIET_PLAN: '__DIET_PLAN_CARD__',
+} as const;
+
+export type CardType = typeof CardType[keyof typeof CardType];
+
+// 定义路由参数类型
+export type CoachScreenParams = {
+  name?: string;
+  action?: 'diet' | 'weight' | 'mood' | 'workout';
+  subAction?: 'record' | 'photo' | 'text' | 'card';
+  meal?: 'breakfast' | 'lunch' | 'dinner' | 'snack';
+  message?: string;
+};
+
+// 快捷操作按钮类型
+export type QuickChip = {
+  key: string;
+  label: string;
+  action: () => void;
+};
+
+// 选中的图片类型
+export type SelectedImage = {
+  id: string;
+  localUri: string;
+  width?: number;
+  height?: number;
+  progress: number;
+  uploadedKey?: string;
+  uploadedUrl?: string;
+  error?: string;
+};