Scaffold @forte/admin package with React, Vite, shadcn/ui, TanStack Router

Sets up the admin frontend with login page, auth guard, API client, Zustand
auth store, and all shadcn/ui components. Vite proxies /v1 to backend in dev.

packages/admin/src/routes/__root.tsx

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+import { createRootRoute, Outlet } from '@tanstack/react-router'
+import { Toaster } from 'sonner'
+
+export const Route = createRootRoute({
+  component: RootLayout,
+})
+
+function RootLayout() {
+  return (
+    <>
+      <Outlet />
+      <Toaster position="bottom-right" />
+    </>
+  )
+}

packages/admin/src/routes/_authenticated.tsx

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+import { createFileRoute, Outlet, redirect } from '@tanstack/react-router'
+import { useAuthStore } from '@/stores/auth.store'
+
+export const Route = createFileRoute('/_authenticated')({
+  beforeLoad: () => {
+    const { token } = useAuthStore.getState()
+    if (!token) {
+      throw redirect({ to: '/login' })
+    }
+  },
+  component: AuthenticatedLayout,
+})
+
+function AuthenticatedLayout() {
+  return (
+    <div className="min-h-screen bg-background text-foreground">
+      <div className="flex">
+        <nav className="w-56 border-r border-border bg-sidebar min-h-screen p-4 space-y-2">
+          <h2 className="text-lg font-semibold text-sidebar-foreground mb-4">Forte</h2>
+          <a href="/accounts" className="block px-3 py-2 rounded-md text-sm text-sidebar-foreground hover:bg-sidebar-accent">
+            Accounts
+          </a>
+        </nav>
+        <main className="flex-1 p-6">
+          <Outlet />
+        </main>
+      </div>
+    </div>
+  )
+}

packages/admin/src/routes/_authenticated/accounts/index.tsx

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+import { createFileRoute } from '@tanstack/react-router'
+
+export const Route = createFileRoute('/_authenticated/accounts/')({
+  component: AccountsListPage,
+})
+
+function AccountsListPage() {
+  return (
+    <div>
+      <h1 className="text-2xl font-bold">Accounts</h1>
+      <p className="text-muted-foreground mt-2">Account list — coming next phase</p>
+    </div>
+  )
+}

packages/admin/src/routes/_authenticated/index.tsx

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+import { createFileRoute, redirect } from '@tanstack/react-router'
+
+export const Route = createFileRoute('/_authenticated/')({
+  beforeLoad: () => {
+    throw redirect({ to: '/accounts' })
+  },
+})

packages/admin/src/routes/login.tsx

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+import { useState } from 'react'
+import { createFileRoute, useNavigate } from '@tanstack/react-router'
+import { useAuthStore } from '@/stores/auth.store'
+import { login } from '@/api/auth'
+import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
+import { Label } from '@/components/ui/label'
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
+
+export const Route = createFileRoute('/login')({
+  component: LoginPage,
+})
+
+function LoginPage() {
+  const navigate = useNavigate()
+  const setAuth = useAuthStore((s) => s.setAuth)
+  const [email, setEmail] = useState('')
+  const [password, setPassword] = useState('')
+  const [error, setError] = useState('')
+  const [loading, setLoading] = useState(false)
+
+  async function handleSubmit(e: React.FormEvent) {
+    e.preventDefault()
+    setError('')
+    setLoading(true)
+
+    try {
+      const res = await login(email, password)
+      setAuth(res.token, res.user)
+      navigate({ to: '/accounts' })
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Login failed')
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-background">
+      <Card className="w-full max-w-sm">
+        <CardHeader className="text-center">
+          <CardTitle className="text-2xl">Forte</CardTitle>
+          <p className="text-sm text-muted-foreground">Sign in to your account</p>
+        </CardHeader>
+        <CardContent>
+          <form onSubmit={handleSubmit} className="space-y-4">
+            <div className="space-y-2">
+              <Label htmlFor="email">Email</Label>
+              <Input
+                id="email"
+                type="email"
+                placeholder="you@example.com"
+                value={email}
+                onChange={(e) => setEmail(e.target.value)}
+                required
+              />
+            </div>
+            <div className="space-y-2">
+              <Label htmlFor="password">Password</Label>
+              <Input
+                id="password"
+                type="password"
+                value={password}
+                onChange={(e) => setPassword(e.target.value)}
+                required
+              />
+            </div>
+            {error && (
+              <p className="text-sm text-destructive">{error}</p>
+            )}
+            <Button type="submit" className="w-full" disabled={loading}>
+              {loading ? 'Signing in...' : 'Sign in'}
+            </Button>
+          </form>
+        </CardContent>
+      </Card>
+    </div>
+  )
+}