#978 safe-align: 固化 frontend-v2 空白页修复真相源

- 新增 frontend-v2/ 为生产前端真相源（此前仅容器 dist，未入 git）
- vite.config.ts: minify:false 根治压缩器压坏 react-router 6.28 (o.slice)
- useApi.ts: asArray select 防御非裸数组返回值
- LandingPage/AppServices: Array.isArray coerce 双重防御 (apps.slice)
- 关联: INCIDENT-2026-08-23-blank-page.md / SOP-FRONTEND-ITERATIVE-DEVELOPMENT.md
- 公网验证通过 2026-08-23 09:31 (DOM 24493B, 无 slice 错误)

frontend-v2/src/components/ui/button.tsx

@@ -0,0 +1,52 @@
+import * as React from 'react';
+import { Slot } from '@radix-ui/react-slot';
+import { cva, type VariantProps } from 'class-variance-authority';
+import { cn } from '@/lib/utils';
+
+const buttonVariants = cva(
+  'inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-lg text-sm font-medium transition-all duration-200 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50 cursor-pointer',
+  {
+    variants: {
+      variant: {
+        default: 'bg-primary text-primary-foreground hover:bg-primary/90 shadow-sm',
+        destructive: 'bg-destructive text-destructive-foreground hover:bg-destructive/90 shadow-sm',
+        outline: 'border border-border bg-background hover:bg-accent hover:text-accent-foreground',
+        secondary: 'bg-secondary text-secondary-foreground hover:bg-secondary/80',
+        ghost: 'hover:bg-accent hover:text-accent-foreground',
+        link: 'text-primary underline-offset-4 hover:underline',
+      },
+      size: {
+        default: 'h-10 px-4 py-2',
+        sm: 'h-9 rounded-md px-3',
+        lg: 'h-11 rounded-lg px-8',
+        icon: 'h-10 w-10',
+      },
+    },
+    defaultVariants: {
+      variant: 'default',
+      size: 'default',
+    },
+  }
+);
+
+export interface ButtonProps
+  extends React.ButtonHTMLAttributes<HTMLButtonElement>,
+    VariantProps<typeof buttonVariants> {
+  asChild?: boolean;
+}
+
+const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
+  ({ className, variant, size, asChild = false, ...props }, ref) => {
+    const Comp = asChild ? Slot : 'button';
+    return (
+      <Comp
+        className={cn(buttonVariants({ variant, size, className }))}
+        ref={ref}
+        {...props}
+      />
+    );
+  }
+);
+Button.displayName = 'Button';
+
+export { Button, buttonVariants };