feat: 养护模板/社区运营/体重趋势/计划日历 + 雪花ID重构 + 文件表与图片上传

后端
- 主键改雪花字符串 ID（pkg/idgen + Base.BeforeCreate），全表外键/JWT/中间件随之调整
- 新增 files 表：/api/upload 按 MD5 去重，返回 {id,url,md5}，服务端只收图片
- 头像/记录附图/帖子图改 file_id 关联，读取解析为 URL
- 养护模板（物种×阶段）后台可配 + AI 生成草稿；建档按模板生成任务/计划/提醒
- 社区 AI 运营：虚拟账号池 + 每日定时/手动生成，帖子带 AI 标
- 计划路线图节点带真实日期；首页周历与计划日历同源；新增 day-plan 当日安排
- 体重趋势接口带备注；记录列表分页

小程序
- 公共图片上传 utils/upload.js（仅图片）；记录拍照/我的头像/社区发图三处接入
- 首页日历点选查当日任务；记录页体重趋势可点看备注 + 时间轴分页折叠
- 计划页日历点选查当日计划；自定义 tabBar 高度调整

后台（React）
- 新增「养护模板」「社区运营」页；用户管理加机器人筛选

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

pets-be/internal/service/community.go

@@ -1,12 +1,49 @@
 package service
 
 import (
+	"encoding/json"
+
 	"gorm.io/datatypes"
 	"gorm.io/gorm"
 
 	"github.com/sundynix/pets-be/internal/model"
 )
 
+// attachPostImages 把帖子的 ImageFileIDs 解析为可展示的 Images（URL 数组）。
+// 机器人帖 ImageFileIDs 为空，保留其 Images（emoji）不变。
+func (s *Service) attachPostImages(posts []model.Post) {
+	perPost := make([][]string, len(posts))
+	all := []string{}
+	for i := range posts {
+		if len(posts[i].ImageFileIDs) == 0 {
+			continue
+		}
+		var ids []string
+		if json.Unmarshal(posts[i].ImageFileIDs, &ids) == nil && len(ids) > 0 {
+			perPost[i] = ids
+			all = append(all, ids...)
+		}
+	}
+	if len(all) == 0 {
+		return
+	}
+	urlMap := s.fileURLs(all)
+	for i := range posts {
+		if len(perPost[i]) == 0 {
+			continue
+		}
+		urls := make([]string, 0, len(perPost[i]))
+		for _, id := range perPost[i] {
+			if u := urlMap[id]; u != "" {
+				urls = append(urls, u)
+			}
+		}
+		if b, err := json.Marshal(urls); err == nil {
+			posts[i].Images = datatypes.JSON(b)
+		}
+	}
+}
+
 // tabTag 将 feed tab 映射为标签过滤（空表示不过滤）
 func tabTag(tab string) string {
 	switch tab {
@@ -35,11 +72,12 @@ func (s *Service) ListPosts(tab string, offset, limit int) ([]model.Post, int64,
 	if err := q.Order("id desc").Offset(offset).Limit(limit).Find(&posts).Error; err != nil {
 		return nil, 0, err
 	}
+	s.attachPostImages(posts)
 	return posts, total, nil
 }
 
 // GetPost 帖子详情
-func (s *Service) GetPost(postID uint) (*model.Post, error) {
+func (s *Service) GetPost(postID string) (*model.Post, error) {
 	var p model.Post
 	if err := s.db.First(&p, postID).Error; err != nil {
 		if err == gorm.ErrRecordNotFound {
@@ -47,20 +85,23 @@ func (s *Service) GetPost(postID uint) (*model.Post, error) {
 		}
 		return nil, err
 	}
-	return &p, nil
+	one := []model.Post{p}
+	s.attachPostImages(one)
+	return &one[0], nil
 }
 
 // PostInput 发帖入参
 type PostInput struct {
-	PetID    *uint
-	Identity string
-	Content  string
-	Tags     datatypes.JSON
-	Images   datatypes.JSON
+	PetID        *string
+	Identity     string
+	Content      string
+	Tags         datatypes.JSON
+	Images       datatypes.JSON
+	ImageFileIDs datatypes.JSON
 }
 
 // CreatePost 发帖
-func (s *Service) CreatePost(userID uint, in PostInput) (*model.Post, error) {
+func (s *Service) CreatePost(userID string, in PostInput) (*model.Post, error) {
 	authorName := "匿名宠友"
 	authorEmoji := "🐾"
 	switch in.Identity {
@@ -78,16 +119,18 @@ func (s *Service) CreatePost(userID uint, in PostInput) (*model.Post, error) {
 	p := model.Post{
 		UserID: userID, PetID: in.PetID, AuthorName: authorName, AuthorEmoji: authorEmoji,
 		Identity: in.Identity, Content: in.Content, Tags: in.Tags, Images: in.Images,
-		Status: model.PostPublished,
+		ImageFileIDs: in.ImageFileIDs, Status: model.PostPublished,
 	}
 	if err := s.db.Create(&p).Error; err != nil {
 		return nil, err
 	}
-	return &p, nil
+	one := []model.Post{p}
+	s.attachPostImages(one)
+	return &one[0], nil
 }
 
 // LikePost 点赞（幂等：已赞则不重复计数）
-func (s *Service) LikePost(userID, postID uint) (int, error) {
+func (s *Service) LikePost(userID, postID string) (int, error) {
 	if _, err := s.GetPost(postID); err != nil {
 		return 0, err
 	}
@@ -110,7 +153,7 @@ func (s *Service) LikePost(userID, postID uint) (int, error) {
 }
 
 // UnlikePost 取消点赞
-func (s *Service) UnlikePost(userID, postID uint) (int, error) {
+func (s *Service) UnlikePost(userID, postID string) (int, error) {
 	if _, err := s.GetPost(postID); err != nil {
 		return 0, err
 	}
@@ -131,7 +174,7 @@ func (s *Service) UnlikePost(userID, postID uint) (int, error) {
 	return s.postLikeCount(postID)
 }
 
-func (s *Service) postLikeCount(postID uint) (int, error) {
+func (s *Service) postLikeCount(postID string) (int, error) {
 	var p model.Post
 	if err := s.db.Select("like_count").First(&p, postID).Error; err != nil {
 		return 0, err
@@ -140,7 +183,7 @@ func (s *Service) postLikeCount(postID uint) (int, error) {
 }
 
 // ListComments 评论分页
-func (s *Service) ListComments(postID uint, offset, limit int) ([]model.Comment, int64, error) {
+func (s *Service) ListComments(postID string, offset, limit int) ([]model.Comment, int64, error) {
 	q := s.db.Model(&model.Comment{}).Where("post_id = ? AND status = ?", postID, "published")
 	var total int64
 	if err := q.Count(&total).Error; err != nil {
@@ -154,7 +197,7 @@ func (s *Service) ListComments(postID uint, offset, limit int) ([]model.Comment,
 }
 
 // CreateComment 评论
-func (s *Service) CreateComment(userID, postID uint, content string) (*model.Comment, error) {
+func (s *Service) CreateComment(userID, postID string, content string) (*model.Comment, error) {
 	if _, err := s.GetPost(postID); err != nil {
 		return nil, err
 	}