feat: 新增心情打卡功能模块

实现心情打卡的完整功能，包括数据库表设计、API接口、业务逻辑和文档说明。支持记录多种心情类型、强度评分和统计分析功能。

test-mood-checkins.http

@@ -0,0 +1,94 @@
+### 心情打卡功能测试
+
+### 1. 创建心情打卡 - 开心
+POST http://localhost:3000/mood-checkins
+Authorization: Bearer YOUR_JWT_TOKEN
+Content-Type: application/json
+
+{
+  "moodType": "happy",
+  "intensity": 8,
+  "description": "今天完成了重要的项目，心情很好！",
+  "checkinDate": "2025-08-21",
+  "metadata": {
+    "tags": ["工作", "成就感"],
+    "trigger": "完成项目里程碑"
+  }
+}
+
+### 2. 创建心情打卡 - 焦虑
+POST http://localhost:3000/mood-checkins
+Authorization: Bearer YOUR_JWT_TOKEN
+Content-Type: application/json
+
+{
+  "moodType": "anxious",
+  "intensity": 6,
+  "description": "明天有重要的会议，感到有些紧张",
+  "checkinDate": "2025-08-21",
+  "metadata": {
+    "tags": ["工作", "压力"],
+    "trigger": "重要会议前的紧张"
+  }
+}
+
+### 3. 创建心情打卡 - 心动
+POST http://localhost:3000/mood-checkins
+Authorization: Bearer YOUR_JWT_TOKEN
+Content-Type: application/json
+
+{
+  "moodType": "excited",
+  "intensity": 9,
+  "description": "看到喜欢的人发来消息，心跳加速",
+  "checkinDate": "2025-08-21",
+  "metadata": {
+    "tags": ["感情", "甜蜜"],
+    "trigger": "收到心仪对象的消息"
+  }
+}
+
+### 3. 获取今日心情打卡
+GET http://localhost:3000/mood-checkins/daily
+Authorization: Bearer YOUR_JWT_TOKEN
+
+### 4. 获取指定日期心情打卡
+GET http://localhost:3000/mood-checkins/daily?date=2025-08-21
+Authorization: Bearer YOUR_JWT_TOKEN
+
+### 5. 获取心情打卡历史
+GET http://localhost:3000/mood-checkins/history?startDate=2025-08-01&endDate=2025-08-31
+Authorization: Bearer YOUR_JWT_TOKEN
+
+### 6. 获取心情打卡历史（按类型过滤）
+GET http://localhost:3000/mood-checkins/history?startDate=2025-08-01&endDate=2025-08-31&moodType=happy
+Authorization: Bearer YOUR_JWT_TOKEN
+
+### 7. 获取心情统计数据
+GET http://localhost:3000/mood-checkins/statistics?startDate=2025-08-01&endDate=2025-08-31
+Authorization: Bearer YOUR_JWT_TOKEN
+
+### 8. 更新心情打卡
+PUT http://localhost:3000/mood-checkins
+Authorization: Bearer YOUR_JWT_TOKEN
+Content-Type: application/json
+
+{
+  "id": "MOOD_CHECKIN_ID",
+  "moodType": "thrilled",
+  "intensity": 9,
+  "description": "更新后的心情描述 - 非常兴奋！",
+  "metadata": {
+    "tags": ["更新", "兴奋"],
+    "trigger": "收到好消息"
+  }
+}
+
+### 9. 删除心情打卡
+DELETE http://localhost:3000/mood-checkins
+Authorization: Bearer YOUR_JWT_TOKEN
+Content-Type: application/json
+
+{
+  "id": "MOOD_CHECKIN_ID"
+}