feat: 就地通过评审，并为已过审用户提供默认可关的免审发布

帖/评管理入口可直接通过；站点默认信任已有 published 内容的用户后续直发。

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

frontend/app/admin/appearance/AppearanceAdmin.tsx

@@ -58,7 +58,7 @@ export default function AppearanceAdmin({ initialAccent }: { initialAccent: stri
     if (!normalized || saving) return;
     setSaving(true);
     try {
-      const res = await apiUpdateSiteSettings(submitHex);
+      const res = await apiUpdateSiteSettings({ accent: submitHex });
       const next = (res.accent || "").toLowerCase();
       setSavedHex(next);
       applyAccentTheme(next || null);