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/config/config-workflow-section.tsx

@@ -0,0 +1,40 @@
+import type { ReactNode } from "react";
+
+import { cn } from "@/lib/utils";
+
+type ConfigWorkflowSectionProps = {
+  step: number;
+  title: string;
+  description?: ReactNode;
+  children: ReactNode;
+  className?: string;
+  contentClassName?: string;
+};
+
+/** 编号步骤卡片，用于赔率/回水等合并配置页主栏分区。 */
+export function ConfigWorkflowSection({
+  step,
+  title,
+  description,
+  children,
+  className,
+  contentClassName,
+}: ConfigWorkflowSectionProps) {
+  return (
+    <section className={cn("overflow-hidden rounded-xl border border-border/60 bg-card", className)}>
+      <div className="flex gap-3 border-b border-border/50 px-4 py-3.5 sm:px-5">
+        <span
+          aria-hidden
+          className="flex size-7 shrink-0 items-center justify-center rounded-full bg-primary text-sm font-semibold text-primary-foreground"
+        >
+          {step}
+        </span>
+        <div className="min-w-0 flex-1 space-y-0.5">
+          <h3 className="text-base font-semibold tracking-tight">{title}</h3>
+          {description ? <div className="text-sm text-muted-foreground">{description}</div> : null}
+        </div>
+      </div>
+      <div className={cn("px-4 py-4 sm:px-5", contentClassName)}>{children}</div>
+    </section>
+  );
+}