feat(csms): add setup routes and pages for initial user creation

apps/web/app/login/page.tsx

@@ -1,13 +1,15 @@
 "use client";
 
 import { useState } from "react";
-import { useRouter } from "next/navigation";
+import { useRouter, useSearchParams } from "next/navigation";
 import { Alert, Button, Card, CloseButton, Input, Label, TextField } from "@heroui/react";
 import { Thunderbolt } from "@gravity-ui/icons";
 import { authClient } from "@/lib/auth-client";
 
 export default function LoginPage() {
   const router = useRouter();
+  const searchParams = useSearchParams();
+  const justSetup = searchParams.get("setup") === "1";
   const [username, setUsername] = useState("");
   const [password, setPassword] = useState("");
   const [error, setError] = useState("");
@@ -52,6 +54,15 @@ export default function LoginPage() {
       <Card className="w-full max-w-sm">
         <Card.Content>
           <form onSubmit={handleSubmit} className="space-y-4">
+            {justSetup && (
+              <Alert status="success">
+                <Alert.Indicator />
+                <Alert.Content>
+                  <Alert.Title>初始化完成</Alert.Title>
+                  <Alert.Description>根管理员账号已创建，请登录。</Alert.Description>
+                </Alert.Content>
+              </Alert>
+            )}
             <TextField fullWidth>
               <Label className="text-sm font-medium">用户名</Label>
               <Input