feat(comments): 支持编辑与管理可见历史，采纳展示改用楼层号

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/service/post_interact.go

@@ -330,6 +330,7 @@ func EnsureDeadlineOnPublish(typeMeta, postType string, publishedAt time.Time) (
 type QuestionState struct {
 	Solved            bool   `json:"solved"`
 	AcceptedCommentID uint   `json:"accepted_comment_id"`
+	AcceptedFloor     int    `json:"accepted_floor"`
 	CanAccept         bool   `json:"can_accept"`
 	CanSolve          bool   `json:"can_solve"`
 	CanReopen         bool   `json:"can_reopen"`
@@ -366,6 +367,7 @@ type PollState struct {
 type BountyState struct {
 	Points            int    `json:"points"`
 	AcceptedCommentID uint   `json:"accepted_comment_id"`
+	AcceptedFloor     int    `json:"accepted_floor"`
 	Escrowed          bool   `json:"escrowed"`
 	Refunded          bool   `json:"refunded"`
 	Expired           bool   `json:"expired"`
@@ -425,6 +427,7 @@ func (s *PostService) buildQuestionState(post *model.Post, canManage bool) *Ques
 	return &QuestionState{
 		Solved:            m.Solved,
 		AcceptedCommentID: m.AcceptedCommentID,
+		AcceptedFloor:     FloorNumber(s.db, post.ID, m.AcceptedCommentID),
 		CanAccept:         canManage && !m.Solved,
 		CanSolve:          canManage && !m.Solved,
 		CanReopen:         canManage && m.Solved,
@@ -530,6 +533,7 @@ func (s *PostService) buildBountyState(post *model.Post, canManage bool) *Bounty
 	return &BountyState{
 		Points:            m.Points,
 		AcceptedCommentID: m.AcceptedCommentID,
+		AcceptedFloor:     FloorNumber(s.db, post.ID, m.AcceptedCommentID),
 		Escrowed:          m.Escrowed,
 		Refunded:          m.Refunded,
 		Expired:           m.Expired,