feat(challenges): 新增挑战类型字段并重构进度上报逻辑

- 数据库新增 type 列区分 water/exercise/diet/mood/sleep/weight 六类挑战
- 进度上报由增量模式改为绝对值模式，字段 increment_value → reportedValue
- 服务层按 challenge.targetValue 判断当日是否完成，再按 minimumCheckInDays 统计总进度
- 相关 DTO 与模型同步更新，支持新类型返回

BREAKING CHANGE: 上报接口字段由 increment 改为 value，且为当日绝对值

src/challenges/models/challenge.model.ts

@@ -1,5 +1,6 @@
 import { Table, Column, DataType, Model, HasMany } from 'sequelize-typescript';
 import { ChallengeParticipant } from './challenge-participant.model';
+import { col } from 'sequelize';
 
 export enum ChallengeStatus {
   UPCOMING = 'upcoming',
@@ -7,6 +8,15 @@ export enum ChallengeStatus {
   EXPIRED = 'expired',
 }
 
+export enum ChallengeType {
+  WATER = 'water',
+  EXERCISE = 'exercise',
+  DIET = 'diet',
+  MOOD = 'mood',
+  SLEEP = 'sleep',
+  WEIGHT = 'weight',
+}
+
 @Table({
   tableName: 't_challenges',
   underscored: true,
@@ -126,6 +136,14 @@ export class Challenge extends Model {
   })
   declare ctaLabel: string;
 
+  @Column({
+    type: DataType.ENUM('water', 'exercise', 'diet', 'mood', 'sleep', 'weight'),
+    allowNull: false,
+    defaultValue: ChallengeType.WATER,
+    comment: '挑战类型',
+  })
+  declare type: ChallengeType;
+
   @HasMany(() => ChallengeParticipant)
   declare participants?: ChallengeParticipant[];
 }