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/reminder.go

@@ -0,0 +1,64 @@
+package service
+
+import (
+	"time"
+
+	"github.com/sundynix/pets-be/internal/model"
+)
+
+// ReminderInput 提醒入参
+type ReminderInput struct {
+	Type        string
+	Title       string
+	NextDueDate *time.Time
+	Frequency   string
+}
+
+// ListReminders 宠物的提醒列表
+func (s *Service) ListReminders(userID, petID uint) ([]model.Reminder, error) {
+	if _, err := s.ownedPet(userID, petID); err != nil {
+		return nil, err
+	}
+	var reminders []model.Reminder
+	err := s.db.Where("pet_id = ?", petID).Order("id asc").Find(&reminders).Error
+	return reminders, err
+}
+
+// CreateReminder 新增提醒
+func (s *Service) CreateReminder(userID, petID uint, in ReminderInput) (*model.Reminder, error) {
+	if _, err := s.ownedPet(userID, petID); err != nil {
+		return nil, err
+	}
+	r := model.Reminder{
+		PetID: petID, UserID: userID, Type: in.Type, Title: in.Title,
+		NextDueDate: in.NextDueDate, Frequency: in.Frequency,
+	}
+	if err := s.db.Create(&r).Error; err != nil {
+		return nil, err
+	}
+	return &r, nil
+}
+
+// UpdateReminder 更新提醒
+func (s *Service) UpdateReminder(userID, reminderID uint, fields map[string]any) (*model.Reminder, error) {
+	var r model.Reminder
+	if err := s.db.Where("id = ? AND user_id = ?", reminderID, userID).First(&r).Error; err != nil {
+		return nil, ErrNotFound
+	}
+	if err := s.db.Model(&r).Updates(fields).Error; err != nil {
+		return nil, err
+	}
+	return &r, nil
+}
+
+// DeleteReminder 删除提醒
+func (s *Service) DeleteReminder(userID, reminderID uint) error {
+	res := s.db.Where("id = ? AND user_id = ?", reminderID, userID).Delete(&model.Reminder{})
+	if res.Error != nil {
+		return res.Error
+	}
+	if res.RowsAffected == 0 {
+		return ErrNotFound
+	}
+	return nil
+}