feat: add user and role view sheets with detailed information display

- Created UserViewSheet component to display user details including username, full name, role, status, and timestamps.
- Created RoleViewSheet component to display role details including name, level, status, creation date, and associated permissions.
- Introduced permissions configuration in a new permissions.ts file, defining categories and permission codes for better management.
- Implemented middleware for authentication, ensuring access control for protected routes.

distribution_fe/app/(auth)/login/page.tsx

@@ -1,14 +1,82 @@
+'use client'
+
+import { useState, useEffect, type FormEvent } from 'react'
+import { useRouter } from 'next/navigation'
+import { useAuth } from '@/contexts/auth-context'
+import { getApiError } from '@/lib/api'
+import { Input } from '@/components/ui/input'
+import { Button } from '@/components/ui/button'
+import { Label } from '@/components/ui/label'
+
 export default function LoginPage() {
+  const { login, user, loading } = useAuth()
+  const router = useRouter()
+  const [identifier, setIdentifier] = useState('')
+  const [password, setPassword] = useState('')
+  const [error, setError] = useState<string | null>(null)
+  const [submitting, setSubmitting] = useState(false)
+
+  useEffect(() => {
+    if (!loading && user) {
+      router.replace('/')
+    }
+  }, [user, loading, router])
+
+  async function handleSubmit(e: FormEvent) {
+    e.preventDefault()
+    setError(null)
+    setSubmitting(true)
+    try {
+      await login(identifier, password)
+    } catch (err) {
+      setError(getApiError(err))
+    } finally {
+      setSubmitting(false)
+    }
+  }
+
   return (
     <div className="flex min-h-svh items-center justify-center bg-background">
-      <div className="flex w-full max-w-sm flex-col gap-6 p-6">
+      <form onSubmit={handleSubmit} className="flex w-full max-w-sm flex-col gap-6 p-6">
         <div className="flex flex-col gap-1 text-center">
           <h1 className="text-2xl font-semibold text-foreground">Sign in</h1>
-          <p className="text-sm text-muted-foreground">
-            Authentication will be wired up once the backend is ready.
-          </p>
+          <p className="text-sm text-muted-foreground">Distribution ERP</p>
         </div>
-      </div>
+
+        <div className="flex flex-col gap-4">
+          <div className="flex flex-col gap-1.5">
+            <Label htmlFor="identifier">Email</Label>
+            <Input
+              id="identifier"
+              type="email"
+              autoComplete="email"
+              required
+              value={identifier}
+              onChange={(e) => setIdentifier(e.target.value)}
+            />
+          </div>
+
+          <div className="flex flex-col gap-1.5">
+            <Label htmlFor="password">Password</Label>
+            <Input
+              id="password"
+              type="password"
+              autoComplete="current-password"
+              required
+              value={password}
+              onChange={(e) => setPassword(e.target.value)}
+            />
+          </div>
+
+          {error && (
+            <p className="text-sm text-destructive">{error}</p>
+          )}
+
+          <Button type="submit" disabled={submitting} className="w-full">
+            {submitting ? 'Signing in…' : 'Sign in'}
+          </Button>
+        </div>
+      </form>
     </div>
   )
 }