feat: add admin user management (create, password change)

app/admin/users/UserManager.tsx

@@ -0,0 +1,75 @@
+'use client';
+
+import React, { useState } from 'react';
+import UserForm from '../components/UserForm';
+import DeleteButton from '../components/DeleteButton';
+import { deleteAdmin } from '../actions';
+
+interface UserManagerProps {
+  users: any[];
+}
+
+export default function UserManager({ users }: UserManagerProps) {
+  const [showForm, setShowForm] = useState(false);
+  const [editingUser, setEditingUser] = useState<any>(null);
+
+  const handleEdit = (user: any) => {
+    setEditingUser(user);
+    setShowForm(true);
+  };
+
+  const handleClose = () => {
+    setShowForm(false);
+    setEditingUser(null);
+  };
+
+  return (
+    <div className="admin-users">
+      <div className="admin-page-header" style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: '2rem' }}>
+        <div>
+          <h1>Kullanıcılar</h1>
+          <p>Yönetici hesaplarını yönetin</p>
+        </div>
+        <button className="admin-btn" onClick={() => setShowForm(true)}>
+          <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" style={{width: '16px'}}><line x1="12" y1="5" x2="12" y2="19" /><line x1="5" y1="12" x2="19" y2="12" /></svg>
+          Yeni Admin Ekle
+        </button>
+      </div>
+
+      <div className="admin-card">
+        <table className="admin-table">
+          <thead>
+            <tr>
+              <th>Kullanıcı Adı</th>
+              <th>Oluşturulma</th>
+              <th>İşlemler</th>
+            </tr>
+          </thead>
+          <tbody>
+            {users.map((user) => (
+              <tr key={user.id}>
+                <td style={{ fontWeight: 500, color: '#fff' }}>{user.username}</td>
+                <td style={{ color: 'var(--text-muted)', fontSize: '0.85rem' }}>
+                  {new Date(user.createdAt).toLocaleDateString('tr-TR')}
+                </td>
+                <td className="actions-cell">
+                  <button className="action-btn" onClick={() => handleEdit(user)}>Şifre Değiştir</button>
+                  {users.length > 1 && (
+                    <DeleteButton onDelete={async () => { await deleteAdmin(user.id); }} />
+                  )}
+                </td>
+              </tr>
+            ))}
+          </tbody>
+        </table>
+      </div>
+
+      {showForm && (
+        <UserForm 
+          initialData={editingUser} 
+          onClose={handleClose} 
+        />
+      )}
+    </div>
+  );
+}

app/admin/users/page.tsx

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+import React from 'react';
+import { prisma } from '@/app/lib/prisma';
+import UserManager from './UserManager';
+
+export const dynamic = 'force-dynamic';
+
+export default async function AdminUsersPage() {
+  const users = await prisma.user.findMany({
+    orderBy: { createdAt: 'desc' }
+  });
+
+  return <UserManager users={users} />;
+}