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/task.go

@@ -0,0 +1,63 @@
+package service
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+
+	"github.com/sundynix/pets-be/internal/model"
+)
+
+// ListTasks 列出宠物任务（date 为空则取今天）
+func (s *Service) ListTasks(userID, petID uint, date *time.Time) ([]model.DailyTask, error) {
+	if _, err := s.ownedPet(userID, petID); err != nil {
+		return nil, err
+	}
+	q := s.db.Where("pet_id = ?", petID)
+	if date != nil {
+		start := time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, date.Location())
+		end := start.AddDate(0, 0, 1)
+		q = q.Where("task_date >= ? AND task_date < ?", start, end)
+	}
+	var tasks []model.DailyTask
+	err := q.Order("id asc").Find(&tasks).Error
+	return tasks, err
+}
+
+// ToggleTask 切换任务完成状态
+func (s *Service) ToggleTask(userID, taskID uint) (*model.DailyTask, error) {
+	var task model.DailyTask
+	if err := s.db.Where("id = ? AND user_id = ?", taskID, userID).First(&task).Error; err != nil {
+		if err == gorm.ErrRecordNotFound {
+			return nil, ErrNotFound
+		}
+		return nil, err
+	}
+	task.Done = !task.Done
+	if task.Done {
+		now := time.Now()
+		task.CompletedAt = &now
+	} else {
+		task.CompletedAt = nil
+	}
+	if err := s.db.Save(&task).Error; err != nil {
+		return nil, err
+	}
+	return &task, nil
+}
+
+// CompleteAllTasks 完成宠物今日全部任务
+func (s *Service) CompleteAllTasks(userID, petID uint) ([]model.DailyTask, error) {
+	if _, err := s.ownedPet(userID, petID); err != nil {
+		return nil, err
+	}
+	now := time.Now()
+	start := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
+	end := start.AddDate(0, 0, 1)
+	if err := s.db.Model(&model.DailyTask{}).
+		Where("pet_id = ? AND task_date >= ? AND task_date < ?", petID, start, end).
+		Updates(map[string]any{"done": true, "completed_at": now}).Error; err != nil {
+		return nil, err
+	}
+	return s.ListTasks(userID, petID, &now)
+}