feat: 每日任务顺延与增删改 + 计划到期续期 + 靠谱养护模板 + 图片URL修复

后端
- 每日任务惰性生成：某天为空则从最近一天顺延复制（done 重置），首天用模板
- 任务增删改 API（POST /pets/:id/tasks、PUT/DELETE /tasks/:id），改动自动顺延
- 30 天计划到期自动归档并按当前阶段生成新一轮
- 内置养护模板重写为兽医常识向：狗每阶段含遛狗/牵引/狂犬，猫含猫砂/梳毛/饮水
- 文件 URL 改为按 object_name + 当前配置动态拼接，换 IP/域名不再有旧地址

小程序
- 首页今日任务加「管理」入口：增删改任务弹层
- 记录时间轴显示照片缩略图（可全屏预览）+ 拍照成功提示
- 社区发布条精简为单个「发布图文」按钮，去掉头像/输入框误触

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

pets-be/internal/service/task.go

@@ -8,20 +8,132 @@ import (
 	"github.com/sundynix/pets-be/internal/model"
 )
 
-// ListTasks 列出宠物任务（date 为空则取今天）
+func dayStart(t time.Time) time.Time {
+	return time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location())
+}
+
+// ensureDayTasks 惰性生成某天的任务：今天/未来若为空，则从「最近一次有任务的那天」顺延复制，
+// 无历史则用养护模板。过去的日子不补（保留历史真实）。
+func (s *Service) ensureDayTasks(pet *model.Pet, day time.Time) {
+	start := dayStart(day)
+	if start.Before(dayStart(time.Now())) {
+		return
+	}
+	end := start.AddDate(0, 0, 1)
+	var cnt int64
+	s.db.Model(&model.DailyTask{}).Where("pet_id = ? AND task_date >= ? AND task_date < ?", pet.ID, start, end).Count(&cnt)
+	if cnt > 0 {
+		return
+	}
+
+	var defs []model.DailyTask
+	var latest model.DailyTask
+	if err := s.db.Where("pet_id = ? AND task_date < ?", pet.ID, start).Order("task_date desc, id desc").First(&latest).Error; err == nil {
+		ls := dayStart(latest.TaskDate)
+		var prev []model.DailyTask
+		s.db.Where("pet_id = ? AND task_date >= ? AND task_date < ?", pet.ID, ls, ls.AddDate(0, 0, 1)).Order("id asc").Find(&prev)
+		for _, t := range prev {
+			defs = append(defs, model.DailyTask{
+				PetID: pet.ID, UserID: pet.UserID, TaskDate: start,
+				Title: t.Title, Description: t.Description, Priority: t.Priority, SheetType: t.SheetType,
+			})
+		}
+	} else {
+		for _, it := range s.careTemplateItems(SpeciesOf(pet.Type), pet.Stage) {
+			if it.Kind == model.CareKindTask {
+				defs = append(defs, model.DailyTask{
+					PetID: pet.ID, UserID: pet.UserID, TaskDate: start,
+					Title: it.Title, Description: it.Description, Priority: it.Priority, SheetType: it.SheetType,
+				})
+			}
+		}
+	}
+	if len(defs) > 0 {
+		s.db.Create(&defs)
+	}
+}
+
+// ListTasks 列出宠物某天任务（date 为空则取今天）；今天/未来为空会惰性生成
 func (s *Service) ListTasks(userID, petID string, date *time.Time) ([]model.DailyTask, error) {
+	pet, err := s.ownedPet(userID, petID)
+	if err != nil {
+		return nil, err
+	}
+	target := time.Now()
+	if date != nil {
+		target = *date
+	}
+	s.ensureDayTasks(pet, target)
+
+	start := dayStart(target)
+	end := start.AddDate(0, 0, 1)
+	var tasks []model.DailyTask
+	err = s.db.Where("pet_id = ? AND task_date >= ? AND task_date < ?", petID, start, end).
+		Order("id asc").Find(&tasks).Error
+	return tasks, err
+}
+
+// TaskInput 增/改任务入参
+type TaskInput struct {
+	Title       string
+	Description string
+	Priority    string
+	SheetType   string
+	Date        *time.Time // 仅新增用，默认今天
+}
+
+// CreateTask 为某天新增一条任务（默认今天）
+func (s *Service) CreateTask(userID, petID string, in TaskInput) (*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)
+	day := time.Now()
+	if in.Date != nil {
+		day = *in.Date
 	}
-	var tasks []model.DailyTask
-	err := q.Order("id asc").Find(&tasks).Error
-	return tasks, err
+	t := model.DailyTask{
+		PetID: petID, UserID: userID, TaskDate: dayStart(day),
+		Title: in.Title, Description: in.Description, Priority: in.Priority, SheetType: in.SheetType,
+	}
+	if err := s.db.Create(&t).Error; err != nil {
+		return nil, err
+	}
+	return &t, nil
+}
+
+// UpdateTask 修改任务文案/优先级/关联弹层
+func (s *Service) UpdateTask(userID, taskID string, in TaskInput) (*model.DailyTask, error) {
+	var t model.DailyTask
+	if err := s.db.Where("id = ? AND user_id = ?", taskID, userID).First(&t).Error; err != nil {
+		return nil, ErrNotFound
+	}
+	if err := s.db.Model(&model.DailyTask{}).Where("id = ?", taskID).Updates(map[string]any{
+		"title": in.Title, "description": in.Description, "priority": in.Priority, "sheet_type": in.SheetType,
+	}).Error; err != nil {
+		return nil, err
+	}
+	return s.UpdateTaskReload(taskID)
+}
+
+// UpdateTaskReload 重新读取任务
+func (s *Service) UpdateTaskReload(taskID string) (*model.DailyTask, error) {
+	var t model.DailyTask
+	if err := s.db.First(&t, "id = ?", taskID).Error; err != nil {
+		return nil, ErrNotFound
+	}
+	return &t, nil
+}
+
+// DeleteTask 删除任务
+func (s *Service) DeleteTask(userID, taskID string) error {
+	res := s.db.Where("id = ? AND user_id = ?", taskID, userID).Delete(&model.DailyTask{})
+	if res.Error != nil {
+		return res.Error
+	}
+	if res.RowsAffected == 0 {
+		return ErrNotFound
+	}
+	return nil
 }
 
 // ToggleTask 切换任务完成状态