feat(training-plans): 添加训练项目管理功能

- 新增训练项目模型、DTO和服务，支持创建、更新、删除和批量操作训练项目
- 在控制器中实现训练项目的相关API，包括添加、批量添加、获取、更新、删除和标记完成状态
- 提供训练项目的完成统计功能，支持获取训练计划下所有项目的完成情况
- 更新训练计划模块以集成训练项目管理功能

src/training-plans/training-plans.module.ts

@@ -1,8 +1,10 @@
 import { Module } from '@nestjs/common';
 import { SequelizeModule } from '@nestjs/sequelize';
 import { TrainingPlansService } from './training-plans.service';
+import { ScheduleExerciseService } from './schedule-exercise.service';
 import { TrainingPlansController } from './training-plans.controller';
 import { TrainingPlan } from './models/training-plan.model';
+import { ScheduleExercise } from './models/schedule-exercise.model';
 import { UsersModule } from '../users/users.module';
 import { ActivityLogsModule } from '../activity-logs/activity-logs.module';
 
@@ -10,11 +12,11 @@ import { ActivityLogsModule } from '../activity-logs/activity-logs.module';
   imports: [
     UsersModule,
     ActivityLogsModule,
-    SequelizeModule.forFeature([TrainingPlan]),
+    SequelizeModule.forFeature([TrainingPlan, ScheduleExercise]),
   ],
   controllers: [TrainingPlansController],
-  providers: [TrainingPlansService],
-  exports: [TrainingPlansService],
+  providers: [TrainingPlansService, ScheduleExerciseService],
+  exports: [TrainingPlansService, ScheduleExerciseService],
 })
 export class TrainingPlansModule { }