新增训练计划模块，包括控制器、服务、模型及数据传输对象，更新应用模块以引入新模块，同时在AI教练模块中添加体态评估功能，支持体重识别与更新，优化用户体重历史记录管理。

src/training-plans/models/training-plan.model.ts

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+import { Column, DataType, Index, Model, PrimaryKey, Table } from 'sequelize-typescript';
+
+export type PlanMode = 'daysOfWeek' | 'sessionsPerWeek';
+export type PlanGoal = 'postpartum_recovery' | 'fat_loss' | 'posture_correction' | 'core_strength' | 'flexibility' | 'rehab' | 'stress_relief' | '';
+
+@Table({
+  tableName: 't_training_plans',
+  underscored: true,
+})
+export class TrainingPlan extends Model {
+  @PrimaryKey
+  @Column({ type: DataType.STRING })
+  declare id: string;
+
+  @Column({ type: DataType.STRING, allowNull: false })
+  declare userId: string;
+
+  @Column({ type: DataType.DATE, allowNull: false })
+  declare createdAt: Date;
+
+  @Column({ type: DataType.DATE, allowNull: false })
+  declare startDate: Date;
+
+  @Column({ type: DataType.ENUM('daysOfWeek', 'sessionsPerWeek'), allowNull: false })
+  declare mode: PlanMode;
+
+  @Column({ type: DataType.JSON, allowNull: false, comment: '0-6' })
+  declare daysOfWeek: number[];
+
+  @Column({ type: DataType.INTEGER, allowNull: false })
+  declare sessionsPerWeek: number;
+
+  @Column({
+    type: DataType.ENUM('postpartum_recovery', 'fat_loss', 'posture_correction', 'core_strength', 'flexibility', 'rehab', 'stress_relief', ''),
+    allowNull: false,
+  })
+  declare goal: PlanGoal;
+
+  @Column({ type: DataType.FLOAT, allowNull: true })
+  declare startWeightKg: number | null;
+
+  @Column({ type: DataType.ENUM('morning', 'noon', 'evening', ''), allowNull: false, defaultValue: '' })
+  declare preferredTimeOfDay: 'morning' | 'noon' | 'evening' | '';
+
+  @Column({ type: DataType.DATE, defaultValue: DataType.NOW })
+  declare updatedAt: Date;
+}
+
+