feat(api): add message segments support for posts and comments

Add rich message segment support enabling structured content (text, images, votes, mentions) in posts and comments. Includes segments field in models, DTOs, handlers, and services. Also adds @mention notification processing and migrates vote data to embedded segments.

internal/dto/dto.go

@@ -1,8 +1,8 @@
-package dto
+package dto
 
 import (
-	"with_you/internal/model"
 	"time"
+	"with_you/internal/model"
 )
 
 // ==================== User DTOs ====================
@@ -143,54 +143,56 @@ type PostImageResponse struct {
 
 // PostResponse 帖子响应（列表用）
 type PostResponse struct {
-	ID              string              `json:"id"`
-	UserID          string              `json:"user_id"`
-	ChannelID       *string             `json:"channel_id,omitempty"`
-	Title           string              `json:"title"`
-	Content         string              `json:"content"`
-	Images          []PostImageResponse `json:"images"`
-	Status          string              `json:"status,omitempty"`
-	LikesCount      int                 `json:"likes_count"`
-	CommentsCount   int                 `json:"comments_count"`
-	FavoritesCount  int                 `json:"favorites_count"`
-	SharesCount     int                 `json:"shares_count"`
-	ViewsCount      int                 `json:"views_count"`
-	IsPinned        bool                `json:"is_pinned"`
-	IsLocked        bool                `json:"is_locked"`
-	IsVote          bool                `json:"is_vote"`
-	CreatedAt       string              `json:"created_at"`
-	UpdatedAt       string              `json:"updated_at"`
-	ContentEditedAt string              `json:"content_edited_at,omitempty"`
-	Author          *UserResponse       `json:"author"`
-	IsLiked         bool                `json:"is_liked"`
-	IsFavorited     bool                `json:"is_favorited"`
-	Channel         *PostChannelBrief   `json:"channel,omitempty"`
+	ID              string                `json:"id"`
+	UserID          string                `json:"user_id"`
+	ChannelID       *string               `json:"channel_id,omitempty"`
+	Title           string                `json:"title"`
+	Content         string                `json:"content"`
+	Segments        model.MessageSegments `json:"segments,omitempty"`
+	Images          []PostImageResponse   `json:"images"`
+	Status          string                `json:"status,omitempty"`
+	LikesCount      int                   `json:"likes_count"`
+	CommentsCount   int                   `json:"comments_count"`
+	FavoritesCount  int                   `json:"favorites_count"`
+	SharesCount     int                   `json:"shares_count"`
+	ViewsCount      int                   `json:"views_count"`
+	IsPinned        bool                  `json:"is_pinned"`
+	IsLocked        bool                  `json:"is_locked"`
+	IsVote          bool                  `json:"is_vote"`
+	CreatedAt       string                `json:"created_at"`
+	UpdatedAt       string                `json:"updated_at"`
+	ContentEditedAt string                `json:"content_edited_at,omitempty"`
+	Author          *UserResponse         `json:"author"`
+	IsLiked         bool                  `json:"is_liked"`
+	IsFavorited     bool                  `json:"is_favorited"`
+	Channel         *PostChannelBrief     `json:"channel,omitempty"`
 }
 
 // PostDetailResponse 帖子详情响应
 type PostDetailResponse struct {
-	ID              string              `json:"id"`
-	UserID          string              `json:"user_id"`
-	ChannelID       *string             `json:"channel_id,omitempty"`
-	Title           string              `json:"title"`
-	Content         string              `json:"content"`
-	Images          []PostImageResponse `json:"images"`
-	Status          string              `json:"status"`
-	LikesCount      int                 `json:"likes_count"`
-	CommentsCount   int                 `json:"comments_count"`
-	FavoritesCount  int                 `json:"favorites_count"`
-	SharesCount     int                 `json:"shares_count"`
-	ViewsCount      int                 `json:"views_count"`
-	IsPinned        bool                `json:"is_pinned"`
-	IsLocked        bool                `json:"is_locked"`
-	IsVote          bool                `json:"is_vote"`
-	CreatedAt       string              `json:"created_at"`
-	UpdatedAt       string              `json:"updated_at"`
-	ContentEditedAt string              `json:"content_edited_at,omitempty"`
-	Author          *UserResponse       `json:"author"`
-	IsLiked         bool                `json:"is_liked"`
-	IsFavorited     bool                `json:"is_favorited"`
-	Channel         *PostChannelBrief   `json:"channel,omitempty"`
+	ID              string                `json:"id"`
+	UserID          string                `json:"user_id"`
+	ChannelID       *string               `json:"channel_id,omitempty"`
+	Title           string                `json:"title"`
+	Content         string                `json:"content"`
+	Segments        model.MessageSegments `json:"segments,omitempty"`
+	Images          []PostImageResponse   `json:"images"`
+	Status          string                `json:"status"`
+	LikesCount      int                   `json:"likes_count"`
+	CommentsCount   int                   `json:"comments_count"`
+	FavoritesCount  int                   `json:"favorites_count"`
+	SharesCount     int                   `json:"shares_count"`
+	ViewsCount      int                   `json:"views_count"`
+	IsPinned        bool                  `json:"is_pinned"`
+	IsLocked        bool                  `json:"is_locked"`
+	IsVote          bool                  `json:"is_vote"`
+	CreatedAt       string                `json:"created_at"`
+	UpdatedAt       string                `json:"updated_at"`
+	ContentEditedAt string                `json:"content_edited_at,omitempty"`
+	Author          *UserResponse         `json:"author"`
+	IsLiked         bool                  `json:"is_liked"`
+	IsFavorited     bool                  `json:"is_favorited"`
+	Channel         *PostChannelBrief     `json:"channel,omitempty"`
 }
 
 // ==================== Comment DTOs ====================
@@ -209,6 +211,7 @@ type CommentResponse struct {
 	ParentID     *string                `json:"parent_id"`
 	RootID       *string                `json:"root_id"`
 	Content      string                 `json:"content"`
+	Segments     model.MessageSegments  `json:"segments,omitempty"`
 	Images       []CommentImageResponse `json:"images"`
 	LikesCount   int                    `json:"likes_count"`
 	RepliesCount int                    `json:"replies_count"`
@@ -248,6 +251,7 @@ const (
 	SegmentTypeReply SegmentType = "reply"
 	SegmentTypeFace  SegmentType = "face"
 	SegmentTypeLink  SegmentType = "link"
+	SegmentTypeVote  SegmentType = "vote"
 )
 
 // TextSegmentData 文本数据
@@ -315,6 +319,19 @@ type LinkSegmentData struct {
 	Image       string `json:"image,omitempty"`
 }
 
+// VoteOptionData 投票选项数据
+type VoteOptionData struct {
+	ID      string `json:"id"`
+	Content string `json:"content"`
+}
+
+// VoteSegmentData 投票Segment数据
+type VoteSegmentData struct {
+	Options       []VoteOptionData `json:"options"`
+	MaxChoices    int              `json:"max_choices,omitempty"`
+	IsMultiChoice bool             `json:"is_multi_choice,omitempty"`
+}
+
 // ==================== Message DTOs ====================
 
 // MessageResponse 消息响应
@@ -887,7 +904,16 @@ type CreateVotePostRequest struct {
 	Content     string   `json:"content" binding:"max=2000"`
 	ChannelID   *string  `json:"channel_id,omitempty"`
 	Images      []string `json:"images"`
-	VoteOptions []string `json:"vote_options" binding:"required,min=2,max=10"` // 投票选项，至少2个最多10个
+	VoteOptions []string `json:"vote_options" binding:"required,min=2,max=10"`
+}
+
+// CreatePostWithSegmentsRequest 创建帖子请求（含 segments）
+type CreatePostWithSegmentsRequest struct {
+	Title     string                `json:"title" binding:"required,max=200"`
+	Content   string                `json:"content"`
+	Segments  model.MessageSegments `json:"segments"`
+	Images    []string              `json:"images"`
+	ChannelID *string               `json:"channel_id,omitempty"`
 }
 
 // VoteOptionDTO 投票选项DTO
@@ -943,29 +969,30 @@ type AdminPostListResponse struct {
 
 // AdminPostDetailResponse 管理端帖子详情响应
 type AdminPostDetailResponse struct {
-	ID              string              `json:"id"`
-	UserID          string              `json:"user_id"`
-	ChannelID       *string             `json:"channel_id,omitempty"`
-	Title           string              `json:"title"`
-	Content         string              `json:"content"`
-	Images          []PostImageResponse `json:"images"`
-	Status          string              `json:"status"`
-	LikesCount      int                 `json:"likes_count,omitzero"`
-	CommentsCount   int                 `json:"comments_count,omitzero"`
-	FavoritesCount  int                 `json:"favorites_count,omitzero"`
-	SharesCount     int                 `json:"shares_count,omitzero"`
-	ViewsCount      int                 `json:"views_count,omitzero"`
-	IsPinned        bool                `json:"is_pinned"`
-	IsFeatured      bool                `json:"is_featured"`
-	IsLocked        bool                `json:"is_locked"`
-	IsVote          bool                `json:"is_vote"`
-	RejectReason    string              `json:"reject_reason,omitempty"`
-	ReviewedAt      string              `json:"reviewed_at,omitempty"`
-	ReviewedBy      string              `json:"reviewed_by,omitempty"`
-	CreatedAt       string              `json:"created_at"`
-	UpdatedAt       string              `json:"updated_at"`
-	ContentEditedAt string              `json:"content_edited_at,omitempty"`
-	Author          *UserResponse       `json:"author"`
+	ID              string                `json:"id"`
+	UserID          string                `json:"user_id"`
+	ChannelID       *string               `json:"channel_id,omitempty"`
+	Title           string                `json:"title"`
+	Content         string                `json:"content"`
+	Segments        model.MessageSegments `json:"segments,omitempty"`
+	Images          []PostImageResponse   `json:"images"`
+	Status          string                `json:"status"`
+	LikesCount      int                   `json:"likes_count,omitzero"`
+	CommentsCount   int                   `json:"comments_count,omitzero"`
+	FavoritesCount  int                   `json:"favorites_count,omitzero"`
+	SharesCount     int                   `json:"shares_count,omitzero"`
+	ViewsCount      int                   `json:"views_count,omitzero"`
+	IsPinned        bool                  `json:"is_pinned"`
+	IsFeatured      bool                  `json:"is_featured"`
+	IsLocked        bool                  `json:"is_locked"`
+	IsVote          bool                  `json:"is_vote"`
+	RejectReason    string                `json:"reject_reason,omitempty"`
+	ReviewedAt      string                `json:"reviewed_at,omitempty"`
+	ReviewedBy      string                `json:"reviewed_by,omitempty"`
+	CreatedAt       string                `json:"created_at"`
+	UpdatedAt       string                `json:"updated_at"`
+	ContentEditedAt string                `json:"content_edited_at,omitempty"`
+	Author          *UserResponse         `json:"author"`
 }
 
 // AdminModeratePostRequest 审核帖子请求