refactor: 移除workouts模块依赖，清理训练计划相关注释

src/app.module.ts

@@ -16,7 +16,6 @@ import { ArticlesModule } from './articles/articles.module';
 import { RecommendationsModule } from './recommendations/recommendations.module';
 import { ActivityLogsModule } from './activity-logs/activity-logs.module';
 import { ExercisesModule } from './exercises/exercises.module';
-import { WorkoutsModule } from './workouts/workouts.module';
 import { MoodCheckinsModule } from './mood-checkins/mood-checkins.module';
 import { GoalsModule } from './goals/goals.module';
 import { DietRecordsModule } from './diet-records/diet-records.module';
@@ -56,7 +55,6 @@ import { HealthProfilesModule } from './health-profiles/health-profiles.module';
     RecommendationsModule,
     ActivityLogsModule,
     ExercisesModule,
-    WorkoutsModule,
     MoodCheckinsModule,
     GoalsModule,
     DietRecordsModule,