Add gestión de usuarios en el admin

mvp/b2c/src/app/admin/usuarios/CrearReformistaForm.tsx

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+'use client';
+
+import { useActionState } from 'react';
+import { crearReformista } from './actions';
+
+export function CrearReformistaForm() {
+  const [error, action, pending] = useActionState(crearReformista, null);
+  return (
+    <form action={action} className="bg-white border border-gray-200 rounded-xl p-5 grid grid-cols-1 md:grid-cols-2 gap-3">
+      <h2 className="md:col-span-2 font-bold text-black">Crear reformista</h2>
+      <input name="nombre" placeholder="Nombre" required className="border border-gray-300 rounded-md px-3 py-2 text-sm" />
+      <input name="empresa" placeholder="Empresa" required className="border border-gray-300 rounded-md px-3 py-2 text-sm" />
+      <input name="email" type="email" placeholder="Email" required className="border border-gray-300 rounded-md px-3 py-2 text-sm" />
+      <input name="provincia" placeholder="Provincia" required className="border border-gray-300 rounded-md px-3 py-2 text-sm" />
+      <input name="password" type="password" placeholder="Contraseña (mín. 8)" required className="border border-gray-300 rounded-md px-3 py-2 text-sm" />
+      {error && <p className="md:col-span-2 text-sm text-red-600">{error}</p>}
+      <button type="submit" disabled={pending} className="md:col-span-2 bg-black text-white rounded-md py-2 font-semibold disabled:opacity-60">
+        {pending ? 'Creando…' : 'Crear reformista'}
+      </button>
+    </form>
+  );
+}

mvp/b2c/src/app/admin/usuarios/actions.ts

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+'use server';
+
+import { revalidatePath } from 'next/cache';
+import { requireAdmin } from '@/lib/auth/current-user';
+import { signupSchema, slugify } from '@/lib/validation/signup';
+import { getUserByEmail, createTenantWithOwner, slugDisponible } from '@/db/auth-queries';
+import { setUserStatus } from '@/db/admin-queries';
+import { hashPassword } from '@/lib/auth/password';
+
+export async function crearReformista(_prev: string | null, formData: FormData): Promise<string | null> {
+  await requireAdmin();
+  const parsed = signupSchema.safeParse(Object.fromEntries(formData));
+  if (!parsed.success) return parsed.error.issues[0]?.message ?? 'Datos no válidos.';
+  const data = parsed.data;
+  if (await getUserByEmail(data.email)) return 'Ya existe una cuenta con ese email.';
+
+  let slug = slugify(data.empresa);
+  let n = 1;
+  while (!(await slugDisponible(slug))) slug = `${slugify(data.empresa)}-${++n}`;
+
+  await createTenantWithOwner({
+    nombreEmpresa: data.empresa,
+    slug,
+    provincia: data.provincia,
+    email: data.email,
+    passwordHash: await hashPassword(data.password),
+    nombre: data.nombre,
+  });
+  revalidatePath('/admin/usuarios');
+  return null;
+}
+
+export async function toggleUsuario(formData: FormData) {
+  await requireAdmin();
+  const userId = String(formData.get('userId'));
+  const next = String(formData.get('next')) as 'activo' | 'deshabilitado';
+  await setUserStatus(userId, next);
+  revalidatePath('/admin/usuarios');
+}

mvp/b2c/src/app/admin/usuarios/page.tsx

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+import { listUsers, listTenants } from '@/db/admin-queries';
+import { toggleUsuario } from './actions';
+import { CrearReformistaForm } from './CrearReformistaForm';
+
+export const dynamic = 'force-dynamic';
+
+export default async function UsuariosPage() {
+  const [users, tenants] = await Promise.all([listUsers(), listTenants()]);
+  const empresaDe = new Map(tenants.map((t) => [t.id, t.nombreEmpresa]));
+  return (
+    <div className="flex flex-col gap-8">
+      <h1 className="text-2xl font-black tracking-tight text-black">Usuarios</h1>
+      <CrearReformistaForm />
+      <div className="bg-white border border-gray-200 rounded-xl overflow-hidden">
+        <table className="w-full text-sm">
+          <thead><tr className="border-b border-gray-200 text-left text-xs uppercase tracking-wide text-gray-400">
+            <th className="px-4 py-3">Email</th><th className="px-4 py-3">Rol</th>
+            <th className="px-4 py-3">Empresa</th><th className="px-4 py-3">Estado</th><th className="px-4 py-3"></th>
+          </tr></thead>
+          <tbody>
+            {users.map((u) => (
+              <tr key={u.id} className="border-b border-gray-100 last:border-0">
+                <td className="px-4 py-3 font-medium text-black">{u.email}</td>
+                <td className="px-4 py-3 text-gray-600">{u.role}</td>
+                <td className="px-4 py-3 text-gray-600">{u.tenantId ? empresaDe.get(u.tenantId) ?? '—' : '—'}</td>
+                <td className="px-4 py-3 text-gray-600">{u.status}</td>
+                <td className="px-4 py-3 text-right">
+                  {u.role !== 'admin' && (
+                    <form action={toggleUsuario}>
+                      <input type="hidden" name="userId" value={u.id} />
+                      <input type="hidden" name="next" value={u.status === 'activo' ? 'deshabilitado' : 'activo'} />
+                      <button type="submit" className="text-xs font-medium text-gray-500 hover:text-black">
+                        {u.status === 'activo' ? 'Deshabilitar' : 'Habilitar'}
+                      </button>
+                    </form>
+                  )}
+                </td>
+              </tr>
+            ))}
+          </tbody>
+        </table>
+      </div>
+    </div>
+  );
+}