fix(clinics): adiciona campo senha no formulário de cadastro de clínica

- Form não enviava password → servidor retornava 400 em todo cadastro
- Adicionado input password no modal de cadastro
- pc_name tornado opcional no servidor (já era opcional no UI)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

dental-server/dental-client/src/pages/AdminClinicsPage.jsx

@@ -16,7 +16,7 @@ export default function AdminClinicsPage() {
   const [showAddModal, setShowAddModal] = useState(false);
   const [showTokenModal, setShowTokenModal] = useState(false);
   const [generatedToken, setGeneratedToken] = useState('');
-  const [form, setForm] = useState({ clinic_name: '', pc_name: '', email: '' });
+  const [form, setForm] = useState({ clinic_name: '', pc_name: '', email: '', password: '' });
   const [saving, setSaving] = useState(false);
   const [showSettings, setShowSettings] = useState(false);
   const [showUsers, setShowUsers] = useState(false);
@@ -46,7 +46,7 @@ export default function AdminClinicsPage() {
       const { data } = await api.post('/admin/clinics', form);
       if (data.success) {
         setShowAddModal(false);
-        setForm({ clinic_name: '', pc_name: '', email: '' });
+        setForm({ clinic_name: '', pc_name: '', email: '', password: '' });
         setGeneratedToken(data.machine_token);
         setShowTokenModal(true);
         loadClinics();
@@ -203,6 +203,7 @@ export default function AdminClinicsPage() {
           <div className="form-group"><label>Nome da Clínica *</label><input type="text" required value={form.clinic_name} onChange={set('clinic_name')} placeholder="Ex: Clínica Odonto" /></div>
           <div className="form-group"><label>Nome do PC</label><input type="text" value={form.pc_name} onChange={set('pc_name')} placeholder="Ex: DESKTOP-RECEPCAO" /></div>
           <div className="form-group"><label>E-mail de Contato *</label><input type="email" required value={form.email} onChange={set('email')} placeholder="contato@clinica.com" /></div>
+          <div className="form-group"><label>Senha de Acesso *</label><input type="password" required value={form.password} onChange={set('password')} placeholder="Senha para o cliente Windows" /></div>
           <div className="form-actions">
             <button type="button" className="btn btn-secondary" onClick={() => setShowAddModal(false)}>Cancelar</button>
             <button type="submit" className="btn btn-primary" disabled={saving}>{saving ? 'Salvando...' : 'Salvar e Gerar Token'}</button>

dental-server/routes/admin-clinics.js

@@ -37,7 +37,7 @@ router.get('/', requireAdmin, async (req, res) => {
 router.post('/', requireAdmin, async (req, res) => {
   const { clinic_name, email, password, pc_name } = req.body;
   
-  if (!clinic_name || !email || !password || !pc_name) {
+  if (!clinic_name || !email || !password) {
     return res.status(400).json({ success: false, message: 'Preencha todos os campos obrigatórios' });
   }