refactor(layout, i18n, admin): 优化布局结构与多语言支持

调整 AdminShell 组件的子组件顺序，提升代码可读性。更新 admin-breadcrumb 组件，简化导航标签翻译逻辑，确保多语言支持的一致性。重构 admin-language-switcher 组件，优化语言切换的用户体验，增强界面交互性。更新多语言配置，新增登录界面的副标题，提升用户体验。

src/modules/settings/currency-settings-panel.tsx

@@ -1,5 +1,6 @@
 "use client";
 
+import { Pencil, Trash2 } from "lucide-react";
 import { useCallback, useEffect, useState } from "react";
 import { useExportLabels } from "@/hooks/use-export-labels";
 import { useTranslation } from "react-i18next";
@@ -12,6 +13,7 @@ import {
   putAdminCurrency,
 } from "@/api/admin-currencies";
 import { AdminPageCard } from "@/components/admin/admin-page-card";
+import { AdminRowActionsMenu } from "@/components/admin/admin-row-actions-menu";
 import { AdminStatusBadge } from "@/components/admin/admin-status-badge";
 import { Button } from "@/components/ui/button";
 import { AdminTableExportButton } from "@/components/admin/admin-table-export-button";
@@ -228,7 +230,7 @@ export function CurrencySettingsPanel() {
                 <TableHead className="whitespace-nowrap">{t("currencies.table.decimals", { ns: "config" })}</TableHead>
                 <TableHead className="whitespace-nowrap">{t("currencies.table.enabled", { ns: "config" })}</TableHead>
                 <TableHead className="whitespace-nowrap">{t("currencies.table.bettable", { ns: "config" })}</TableHead>
-                <TableHead className="whitespace-nowrap text-center">{t("currencies.table.actions", { ns: "config" })}</TableHead>
+                <TableHead className="w-14 whitespace-nowrap text-center">{t("currencies.table.actions", { ns: "config" })}</TableHead>
               </TableRow>
             </TableHeader>
             <TableBody>
@@ -267,14 +269,23 @@ export function CurrencySettingsPanel() {
                       </AdminStatusBadge>
                     </TableCell>
                     <TableCell className="text-center">
-                      <div className="flex items-center justify-center gap-2">
-                        <Button variant="outline" size="sm" onClick={() => openEdit(row)}>
-                          {t("currencies.actions.edit", { ns: "config" })}
-                        </Button>
-                        <Button variant="destructive" size="sm" onClick={() => setDeleteTarget(row)}>
-                          {t("currencies.actions.delete", { ns: "config" })}
-                        </Button>
-                      </div>
+                      <AdminRowActionsMenu
+                        actions={[
+                          {
+                            key: "edit",
+                            label: t("currencies.actions.edit", { ns: "config" }),
+                            icon: Pencil,
+                            onClick: () => openEdit(row),
+                          },
+                          {
+                            key: "delete",
+                            label: t("currencies.actions.delete", { ns: "config" }),
+                            icon: Trash2,
+                            destructive: true,
+                            onClick: () => setDeleteTarget(row),
+                          },
+                        ]}
+                      />
                     </TableCell>
                   </TableRow>
                 ))