feat: 关于本站对齐站点公告，增加全部与管理入口

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

backend/service/site_page.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"regexp"
 	"strings"
+	"time"
 	"unicode/utf8"
 
 	"github.com/freefire/jiang13-bbs/model"
@@ -47,6 +48,16 @@ type SidebarPageItem struct {
 	Excerpt string `json:"excerpt"`
 }
 
+// PublishedPageItem 公开单页目录（全部页，含未进侧栏的已发布页）
+type PublishedPageItem struct {
+	ID        uint      `json:"id"`
+	Slug      string    `json:"slug"`
+	Title     string    `json:"title"`
+	Excerpt   string    `json:"excerpt"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
 func (in *SitePageInput) normalize(existing *model.SitePage) error {
 	in.Slug = strings.ToLower(strings.TrimSpace(in.Slug))
 	if in.Slug == "" {
@@ -133,6 +144,27 @@ func (s *SitePageService) ListSidebarPublished() ([]SidebarPageItem, error) {
 	return out, nil
 }
 
+// ListPublished 已发布单页目录（全部页；含未勾选侧栏的）
+func (s *SitePageService) ListPublished() ([]PublishedPageItem, error) {
+	var pages []model.SitePage
+	err := s.db.Where("published = ?", true).
+		Order("sort_order ASC, id ASC").
+		Select("id", "slug", "title", "excerpt", "created_at", "updated_at").
+		Limit(100).
+		Find(&pages).Error
+	if err != nil {
+		return nil, err
+	}
+	out := make([]PublishedPageItem, 0, len(pages))
+	for _, p := range pages {
+		out = append(out, PublishedPageItem{
+			ID: p.ID, Slug: p.Slug, Title: p.Title, Excerpt: p.Excerpt,
+			CreatedAt: p.CreatedAt, UpdatedAt: p.UpdatedAt,
+		})
+	}
+	return out, nil
+}
+
 // GetPublishedBySlug 公开详情（仅已发布）
 func (s *SitePageService) GetPublishedBySlug(slug string) (*model.SitePage, error) {
 	slug = strings.ToLower(strings.TrimSpace(slug))