feat: 实时消息与管理端运营能力

新增群聊/私信与公共 WebSocket 总线，站长用户内容档案，并将通知与待审角标改为推送驱动；同步精简管理仪表盘并修复主题换肤 DOM 冲突。

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

backend/service/actor.go

@@ -1,6 +1,8 @@
 package service
 
 import (
+	"strings"
+
 	"github.com/freefire/jiang13-bbs/model"
 )
 
@@ -107,9 +109,53 @@ func (s *AuthService) GetUserBoardIDs(id uint) ([]uint, error) {
 
 // GetUserIDByUsername 按用户名查 ID（登录失败审计用），用户不存在返回 0
 func (s *AuthService) GetUserIDByUsername(username string) uint {
+	username = strings.TrimSpace(username)
+	if username == "" {
+		return 0
+	}
 	var u model.User
 	if err := s.db.Select("id").Where("username = ?", username).First(&u).Error; err != nil {
 		return 0
 	}
 	return u.ID
 }
+
+// ListBoardModeratorIDs 可审核指定板块的用户 ID：
+// 站长/超管/全站管理员 + 被授权该板的板块管理员（未封禁、未删除）
+func (s *AuthService) ListBoardModeratorIDs(boardID uint) ([]uint, error) {
+	var ids []uint
+	// 全站可审：admin / super_admin / owner
+	if err := s.db.Model(&model.User{}).
+		Where("deleted_at IS NULL AND banned = ? AND role IN ?", false,
+			[]string{string(model.RoleAdmin), string(model.RoleSuperAdmin), string(model.RoleOwner)}).
+		Pluck("id", &ids).Error; err != nil {
+		return nil, err
+	}
+	// 板块管理员（授权该板）
+	var boardAdminIDs []uint
+	if err := s.db.Model(&model.UserBoard{}).
+		Select("user_boards.user_id").
+		Joins("JOIN users ON users.id = user_boards.user_id").
+		Where("user_boards.board_id = ? AND users.deleted_at IS NULL AND users.banned = ? AND users.role = ?",
+			boardID, false, string(model.RoleBoardAdmin)).
+		Pluck("user_boards.user_id", &boardAdminIDs).Error; err != nil {
+		return nil, err
+	}
+	seen := make(map[uint]struct{}, len(ids)+len(boardAdminIDs))
+	out := make([]uint, 0, len(ids)+len(boardAdminIDs))
+	for _, id := range ids {
+		if _, ok := seen[id]; ok {
+			continue
+		}
+		seen[id] = struct{}{}
+		out = append(out, id)
+	}
+	for _, id := range boardAdminIDs {
+		if _, ok := seen[id]; ok {
+			continue
+		}
+		seen[id] = struct{}{}
+		out = append(out, id)
+	}
+	return out, nil
+}