feat(ai-coach,checkins): 实现软删除功能

在AI教练和打卡模块中添加deleted字段，将物理删除改为软删除：
- 在AiConversation和AiMessage模型中添加deleted布尔字段
- 在Checkin模型中添加deleted字段
- 更新所有查询条件添加deleted: false过滤
- 修改删除操作为标记deleted: true而非物理删除
- 在打卡服务中添加重复记录检查逻辑

src/ai-coach/ai-coach.service.ts

@@ -54,7 +54,7 @@ export class AiCoachService {
 
   buildChatHistory = async (userId: string, conversationId: string) => {
     const history = await AiMessage.findAll({
-      where: { userId, conversationId },
+      where: { userId, conversationId, deleted: false },
       order: [['created_at', 'ASC']],
     });
 
@@ -128,7 +128,7 @@ export class AiCoachService {
     const pageSize = Math.min(50, Math.max(1, params.pageSize || 20));
     const offset = (page - 1) * pageSize;
     const { rows, count } = await AiConversation.findAndCountAll({
-      where: { userId },
+      where: { userId, deleted: false },
       order: [['last_message_at', 'DESC']],
       offset,
       limit: pageSize,
@@ -147,10 +147,10 @@ export class AiCoachService {
   }
 
   async getConversationDetail(userId: string, conversationId: string) {
-    const conv = await AiConversation.findOne({ where: { id: conversationId, userId } });
+    const conv = await AiConversation.findOne({ where: { id: conversationId, userId, deleted: false } });
     if (!conv) return null;
     const messages = await AiMessage.findAll({
-      where: { userId, conversationId },
+      where: { userId, conversationId, deleted: false },
       order: [['created_at', 'ASC']],
     });
     return {
@@ -163,10 +163,10 @@ export class AiCoachService {
   }
 
   async deleteConversation(userId: string, conversationId: string): Promise<boolean> {
-    const conv = await AiConversation.findOne({ where: { id: conversationId, userId } });
+    const conv = await AiConversation.findOne({ where: { id: conversationId, userId, deleted: false } });
     if (!conv) return false;
-    await AiMessage.destroy({ where: { userId, conversationId } });
-    await AiConversation.destroy({ where: { id: conversationId, userId } });
+    await AiMessage.update({ deleted: true }, { where: { userId, conversationId } });
+    await AiConversation.update({ deleted: true }, { where: { id: conversationId, userId } });
     return true;
   }
 

src/ai-coach/models/ai-conversation.model.ts

@@ -46,6 +46,13 @@ export class AiConversation extends Model {
   })
   declare updatedAt: Date;
 
+  @Column({
+    type: DataType.BOOLEAN,
+    allowNull: false,
+    defaultValue: false,
+  })
+  declare deleted: boolean;
+
   @HasMany(() => AiMessage)
   declare messages?: AiMessage[];
 }

src/ai-coach/models/ai-message.model.ts

@@ -65,6 +65,13 @@ export class AiMessage extends Model {
   })
   declare updatedAt: Date;
 
+  @Column({
+    type: DataType.BOOLEAN,
+    allowNull: false,
+    defaultValue: false,
+  })
+  declare deleted: boolean;
+
   @BelongsTo(() => AiConversation)
   declare conversation?: AiConversation;
 }