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/admin.go

@@ -0,0 +1,161 @@
+package service
+
+import (
+	"golang.org/x/crypto/bcrypt"
+
+	"github.com/sundynix/pets-be/internal/model"
+)
+
+// AdminLogin 校验管理员账号密码
+func (s *Service) AdminLogin(username, password string) (*model.Admin, error) {
+	var admin model.Admin
+	if err := s.db.Where("username = ?", username).First(&admin).Error; err != nil {
+		return nil, ErrNotFound
+	}
+	if admin.Disabled {
+		return nil, ErrNotFound
+	}
+	if err := bcrypt.CompareHashAndPassword([]byte(admin.PasswordHash), []byte(password)); err != nil {
+		return nil, ErrNotFound
+	}
+	return &admin, nil
+}
+
+// GetAdmin 取管理员
+func (s *Service) GetAdmin(id uint) (*model.Admin, error) {
+	var admin model.Admin
+	if err := s.db.First(&admin, id).Error; err != nil {
+		return nil, ErrNotFound
+	}
+	return &admin, nil
+}
+
+// AdminStats 后台统计
+type AdminStats struct {
+	Users   int64 `json:"users"`
+	Pets    int64 `json:"pets"`
+	Posts   int64 `json:"posts"`
+	Records int64 `json:"records"`
+}
+
+// Stats Dashboard 计数
+func (s *Service) Stats() (*AdminStats, error) {
+	var st AdminStats
+	s.db.Model(&model.User{}).Count(&st.Users)
+	s.db.Model(&model.Pet{}).Count(&st.Pets)
+	s.db.Model(&model.Post{}).Count(&st.Posts)
+	s.db.Model(&model.HealthRecord{}).Count(&st.Records)
+	return &st, nil
+}
+
+// ListUsers 用户分页（keyword 匹配昵称）
+func (s *Service) ListUsers(keyword string, offset, limit int) ([]model.User, int64, error) {
+	q := s.db.Model(&model.User{})
+	if keyword != "" {
+		q = q.Where("nickname LIKE ?", "%"+keyword+"%")
+	}
+	var total int64
+	q.Count(&total)
+	var users []model.User
+	err := q.Order("id desc").Offset(offset).Limit(limit).Find(&users).Error
+	return users, total, err
+}
+
+// SetUserDisabled 启用/禁用用户
+func (s *Service) SetUserDisabled(id uint, disabled bool) error {
+	return s.db.Model(&model.User{}).Where("id = ?", id).Update("disabled", disabled).Error
+}
+
+// ListPetsAdmin 宠物分页
+func (s *Service) ListPetsAdmin(offset, limit int) ([]model.Pet, int64, error) {
+	var total int64
+	s.db.Model(&model.Pet{}).Count(&total)
+	var pets []model.Pet
+	err := s.db.Order("id desc").Offset(offset).Limit(limit).Find(&pets).Error
+	return pets, total, err
+}
+
+// ListPostsAdmin 帖子分页（status 可选过滤）
+func (s *Service) ListPostsAdmin(status string, offset, limit int) ([]model.Post, int64, error) {
+	q := s.db.Model(&model.Post{})
+	if status != "" {
+		q = q.Where("status = ?", status)
+	}
+	var total int64
+	q.Count(&total)
+	var posts []model.Post
+	err := q.Order("id desc").Offset(offset).Limit(limit).Find(&posts).Error
+	return posts, total, err
+}
+
+// SetPostStatus 审核帖子（published/hidden/deleted）
+func (s *Service) SetPostStatus(id uint, status string) error {
+	res := s.db.Model(&model.Post{}).Where("id = ?", id).Update("status", status)
+	if res.Error != nil {
+		return res.Error
+	}
+	if res.RowsAffected == 0 {
+		return ErrNotFound
+	}
+	return nil
+}
+
+// ListCommentsAdmin 评论分页
+func (s *Service) ListCommentsAdmin(offset, limit int) ([]model.Comment, int64, error) {
+	var total int64
+	s.db.Model(&model.Comment{}).Count(&total)
+	var comments []model.Comment
+	err := s.db.Order("id desc").Offset(offset).Limit(limit).Find(&comments).Error
+	return comments, total, err
+}
+
+// DeleteCommentAdmin 删除评论
+func (s *Service) DeleteCommentAdmin(id uint) error {
+	return s.db.Model(&model.Comment{}).Where("id = ?", id).Update("status", "deleted").Error
+}
+
+// ListArticlesAdmin 文章分页（含未发布）
+func (s *Service) ListArticlesAdmin(offset, limit int) ([]model.Article, int64, error) {
+	var total int64
+	s.db.Model(&model.Article{}).Count(&total)
+	var articles []model.Article
+	err := s.db.Order("id desc").Offset(offset).Limit(limit).Find(&articles).Error
+	return articles, total, err
+}
+
+// SaveArticle 新增或更新文章（ID 为 0 则新增）
+func (s *Service) SaveArticle(a *model.Article) error {
+	if a.ID == 0 {
+		return s.db.Create(a).Error
+	}
+	return s.db.Model(&model.Article{}).Where("id = ?", a.ID).Updates(map[string]any{
+		"icon":               a.Icon,
+		"title":              a.Title,
+		"description":        a.Description,
+		"content":            a.Content,
+		"category":           a.Category,
+		"related_sheet_type": a.RelatedSheetType,
+		"published":          a.Published,
+	}).Error
+}
+
+// DeleteArticle 删除文章
+func (s *Service) DeleteArticle(id uint) error {
+	res := s.db.Delete(&model.Article{}, id)
+	if res.Error != nil {
+		return res.Error
+	}
+	if res.RowsAffected == 0 {
+		return ErrNotFound
+	}
+	return nil
+}
+
+// ListProAdmin 会员分页
+func (s *Service) ListProAdmin(offset, limit int) ([]model.ProMembership, int64, error) {
+	var total int64
+	s.db.Model(&model.ProMembership{}).Count(&total)
+	var list []model.ProMembership
+	err := s.db.Order("id desc").Offset(offset).Limit(limit).Find(&list).Error
+	return list, total, err
+}