feat(patients): phase B5 — wire service creation into the detail page

Reuse the existing NewSessionPage (service section/item + insurance coverage +
payment flow → POST /patient/{recordUuid}/session) from the new patient detail:
add a patients-scoped route /admin/patients/:recordUuid/session/new and a
"سرویس جدید" action on the services tab. The multi-step visual restyle and the
standalone invoice-issuance screen remain a follow-up (the underlying
session/billing endpoints already exist).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

assets/admin/pages/PatientDetailPage.test.tsx

@@ -76,6 +76,13 @@ describe('PatientDetailPage (پرونده تب‌دار)', () => {
     expect(await screen.findByPlaceholderText('مثلاً: معاینه اولیه')).toBeInTheDocument();
   });
 
+  it('links "سرویس جدید" on the services tab to the new-session route', async () => {
+    renderDetail();
+    await screen.findByText('ساغر صابری'); // services is the default tab
+    const link = await screen.findByRole('link', { name: /سرویس جدید/ });
+    expect(link).toHaveAttribute('href', '/admin/patients/r1/session/new');
+  });
+
   it('renders the messages tab with a send box', async () => {
     renderDetail();
     await screen.findByText('ساغر صابری');