init: 毛孩子计划 小程序 + Go 后端 + 内嵌后台

- pets-fe: 微信原生小程序（首页/计划/记录/报告/社区/引导），
  服务端驱动、无假数据；弹层改用 scroll-view，打开时隐藏自定义 tabBar
- pets-be: Gin + GORM(MySQL, sundynix_ 前缀) + MinIO，统一响应/分页，
  微信 code2session 登录，provider-neutral AI(DeepSeek)，go:embed React 后台
- 修复：分段选择类型不匹配（字符串 vs 数字）导致选不中

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pets-be/internal/service/record.go

@@ -0,0 +1,108 @@
+package service
+
+import (
+	"fmt"
+	"time"
+
+	"gorm.io/datatypes"
+	"gorm.io/gorm"
+
+	"github.com/sundynix/pets-be/internal/model"
+)
+
+// RecordInput 健康记录入参
+type RecordInput struct {
+	Type        string
+	Icon        string
+	Title       string
+	Description string
+	NumValue    float64
+	Category    string
+	ImageURL    string
+	Extra       datatypes.JSON
+	OccurredAt  *time.Time
+}
+
+// ListRecords 列出宠物的健康记录（可按 type 过滤）
+func (s *Service) ListRecords(userID, petID uint, recordType string) ([]model.HealthRecord, error) {
+	if _, err := s.ownedPet(userID, petID); err != nil {
+		return nil, err
+	}
+	q := s.db.Where("pet_id = ?", petID)
+	if recordType != "" {
+		q = q.Where("type = ?", recordType)
+	}
+	var records []model.HealthRecord
+	err := q.Order("occurred_at desc, id desc").Find(&records).Error
+	return records, err
+}
+
+// CreateRecord 新增健康记录；weight 类型同步更新宠物体重
+func (s *Service) CreateRecord(userID, petID uint, in RecordInput) (*model.HealthRecord, error) {
+	pet, err := s.ownedPet(userID, petID)
+	if err != nil {
+		return nil, err
+	}
+	occurred := time.Now()
+	if in.OccurredAt != nil {
+		occurred = *in.OccurredAt
+	}
+	rec := model.HealthRecord{
+		PetID: petID, UserID: userID, Type: in.Type, Icon: in.Icon,
+		Title: in.Title, Description: in.Description, NumValue: in.NumValue,
+		Category: in.Category, ImageURL: in.ImageURL, Extra: in.Extra, OccurredAt: occurred,
+	}
+	if err := s.db.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Create(&rec).Error; err != nil {
+			return err
+		}
+		if in.Type == model.RecordWeight && in.NumValue > 0 {
+			weight := fmt.Sprintf("%gkg", in.NumValue)
+			if err := tx.Model(&model.Pet{}).Where("id = ?", pet.ID).Update("weight", weight).Error; err != nil {
+				return err
+			}
+		}
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+	return &rec, nil
+}
+
+// DeleteRecord 删除记录
+func (s *Service) DeleteRecord(userID, recordID uint) error {
+	res := s.db.Where("id = ? AND user_id = ?", recordID, userID).Delete(&model.HealthRecord{})
+	if res.Error != nil {
+		return res.Error
+	}
+	if res.RowsAffected == 0 {
+		return ErrNotFound
+	}
+	return nil
+}
+
+// WeightPoint 体重趋势点
+type WeightPoint struct {
+	Value      float64   `json:"value"`
+	OccurredAt time.Time `json:"occurred_at"`
+}
+
+// WeightTrend 最近 N 次体重（升序）
+func (s *Service) WeightTrend(userID, petID uint, limit int) ([]WeightPoint, error) {
+	if _, err := s.ownedPet(userID, petID); err != nil {
+		return nil, err
+	}
+	if limit <= 0 {
+		limit = 7
+	}
+	var records []model.HealthRecord
+	if err := s.db.Where("pet_id = ? AND type = ?", petID, model.RecordWeight).
+		Order("occurred_at desc").Limit(limit).Find(&records).Error; err != nil {
+		return nil, err
+	}
+	points := make([]WeightPoint, 0, len(records))
+	for i := len(records) - 1; i >= 0; i-- {
+		points = append(points, WeightPoint{Value: records[i].NumValue, OccurredAt: records[i].OccurredAt})
+	}
+	return points, nil
+}