chore: 去掉未上线前的旧兼容垫片，板块流收口到首页

鉴权只认 cookie、SEO 只走 Next、sort 与推荐对齐；删除 Bearer、Go sitemap、post_type 回填等冗余路径。

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

backend/handler/board.go

@@ -1,9 +1,13 @@
 package handler
 
 import (
+	"errors"
 	"net/http"
+	"strconv"
 
+	"github.com/freefire/jiang13-bbs/middleware"
 	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
 )
 
 // Boards 获取板块列表
@@ -15,3 +19,43 @@ func (h *Handlers) Boards(c *gin.Context) {
 	}
 	c.JSON(http.StatusOK, gin.H{"boards": nonNilSlice(boards)})
 }
+
+// BoardSidebar 首页选中板块后的右栏聚合数据
+func (h *Handlers) BoardSidebar(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil || id == 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的板块 ID"})
+		return
+	}
+	data, err := h.Board.Sidebar(uint(id))
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"error": "板块不存在"})
+			return
+		}
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	// 热门榜点赞态 + 登录用户签到
+	if claims := middleware.CurrentUser(c); claims != nil {
+		ids := make([]uint, 0, len(data.Hot))
+		for _, p := range data.Hot {
+			ids = append(ids, p.ID)
+		}
+		likedMap := h.Like.BatchHasLiked(ids, claims.ID)
+		for i := range data.Hot {
+			data.Hot[i].Liked = likedMap[data.Hot[i].ID]
+		}
+		if status, err := h.Checkin.Status(claims.ID); err == nil {
+			data.Checkin = status
+		}
+	}
+	c.JSON(http.StatusOK, gin.H{
+		"board":         data.Board,
+		"moderators":    data.Moderators,
+		"stats":         data.Stats,
+		"hot":           data.Hot,
+		"active_users":  data.ActiveUsers,
+		"checkin":       data.Checkin,
+	})
+}