feat: 优化单页编辑、列表留白与友链申请体验

单页全屏编辑并禁用内容门控；对齐 Feed 留白；友链申请区前置并收敛弹框样式；略增大帖子列表标题字号。

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

router/router.go

@@ -224,8 +224,10 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 		adminAPI.PUT("/boards/:id", h.APIAdminUpdateBoard)
 		adminAPI.DELETE("/boards/:id", h.APIAdminDeleteBoard)
 		adminAPI.GET("/pages", h.APIAdminPages)
+		adminAPI.GET("/pages/:id", h.APIAdminGetPage)
 		adminAPI.POST("/pages", h.APIAdminCreatePage)
 		adminAPI.PUT("/pages/:id", h.APIAdminUpdatePage)
+		adminAPI.PUT("/pages/:id/published", h.APIAdminSetPagePublished)
 		adminAPI.DELETE("/pages/:id", h.APIAdminDeletePage)
 		adminAPI.GET("/friend-link-applies", h.APIAdminFriendLinkApplies)
 		adminAPI.PUT("/friend-link-settings", h.APIAdminUpdateFriendLinkSettings)