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/middleware/auth.go

@@ -3,9 +3,7 @@ package middleware
 import (
 	"errors"
 	"net/http"
-	"strings"
 
-	"github.com/freefire/jiang13-bbs/model"
 	"github.com/freefire/jiang13-bbs/service"
 	"github.com/gin-gonic/gin"
 )
@@ -60,27 +58,6 @@ func (m *AuthMiddleware) RequireAuth() gin.HandlerFunc {
 	}
 }
 
-// RequireAdmin 必须管理员（保留兼容；等价于"管理员及以上"，不含纯板块管理员）
-func (m *AuthMiddleware) RequireAdmin() gin.HandlerFunc {
-	return func(c *gin.Context) {
-		user, ok := m.parseToken(c)
-		if !ok {
-			if c.GetBool(AccountBannedKey) {
-				bannedJSON(c)
-				return
-			}
-			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "未登录"})
-			return
-		}
-		if model.RoleLevel(model.Role(user.Role)) < model.RoleLevel(model.RoleAdmin) {
-			c.AbortWithStatusJSON(http.StatusForbidden, gin.H{"error": "需要管理员权限"})
-			return
-		}
-		c.Set("user", user)
-		c.Next()
-	}
-}
-
 // ActorKey 实时权限快照在 gin.Context 中的键
 const ActorKey = "actor"
 
@@ -121,20 +98,13 @@ func (m *AuthMiddleware) RequirePerm(perm string) gin.HandlerFunc {
 }
 
 // parseToken 解析并校验 token：
-// 1. 优先从 HttpOnly cookie 读取，回退 Authorization header
+// 1. 从 HttpOnly cookie（j13_token / 生产 __Host-j13_token）读取
 // 2. 校验 JWT 签名和过期
 // 3. 查 DB 实时校验 token_version 和 banned 状态
 func (m *AuthMiddleware) parseToken(c *gin.Context) (*service.UserClaims, bool) {
 	tokenStr, err := c.Cookie(service.CookieName)
 	if err != nil || tokenStr == "" {
-		auth := c.GetHeader("Authorization")
-		if auth == "" {
-			return nil, false
-		}
-		tokenStr = strings.TrimPrefix(auth, "Bearer ")
-		if tokenStr == auth {
-			return nil, false
-		}
+		return nil, false
 	}
 	claims, err := m.auth.ParseToken(tokenStr)
 	if err != nil {