优化训练计划项目管理功能

- 更新训练项目文档，增加与动作库的智能关联和简化接口操作的说明
- 移除批量操作接口，专注于单项操作，提升用户体验
- 增强数据模型，确保训练项目与动作库的关联性，提升数据一致性和查询性能
- 更新服务逻辑，支持动作存在性验证，确保数据的准确性和完整性

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

@@ -5,6 +5,7 @@ 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 { Exercise } from '../exercises/models/exercise.model';
 import { UsersModule } from '../users/users.module';
 import { ActivityLogsModule } from '../activity-logs/activity-logs.module';
 
@@ -12,7 +13,7 @@ import { ActivityLogsModule } from '../activity-logs/activity-logs.module';
   imports: [
     UsersModule,
     ActivityLogsModule,
-    SequelizeModule.forFeature([TrainingPlan, ScheduleExercise]),
+    SequelizeModule.forFeature([TrainingPlan, ScheduleExercise, Exercise]),
   ],
   controllers: [TrainingPlansController],
   providers: [TrainingPlansService, ScheduleExerciseService],