feat(admin): name the tab for what it shows, prefill the patient, paginate and search

The tab was called 'نوبت‌های بعدی' but shows the whole course — finished sessions
with their recorded readings as much as upcoming ones. It is 'دوره‌های درمان' now.

Booking from a session still made the user search for a patient the page already
had open. The plan response carries the patient's national code (from the
profile, falling back to the user — the same COALESCE PatientController uses,
because users.national_code is routinely empty), and the modal takes a patient
prop that seeds the lookup and hides the search step. The old 'بیمار یافت شد'
card is suppressed in that mode; saying it twice is noise.

Sessions are now searchable and paged. A protocol allows up to 60 steps and a
patient can hold several courses, so an unbounded list was only ever going to
work for the small cases. Search filters on what the card actually shows —
service, staff, status, session number, area names — and runs in the page,
since /plan already returns the whole course and a round trip would add latency
and nothing else.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

assets/admin/pages/PatientDetailPage.tsx

@@ -49,7 +49,7 @@ const TABS: { key: TabKey; label: string; icon: (c: string) => React.ReactNode }
   { key: 'services',     label: 'سرویس‌ها',      icon: (c) => <TabServices color={c} /> },
   { key: 'info',         label: 'اطلاعات پرونده', icon: (c) => <TabInfo color={c} /> },
   { key: 'appointments', label: 'نوبت‌ها',        icon: (c) => <TabCalendar color={c} /> },
-  { key: 'treatment',    label: 'نوبت‌های بعدی',  icon: (c) => <ClipboardDocumentListIcon style={{ width: 18, color: c }} /> },
+  { key: 'treatment',    label: 'دوره‌های درمان', icon: (c) => <ClipboardDocumentListIcon style={{ width: 18, color: c }} /> },
   { key: 'payments',     label: 'پرداخت‌ها',      icon: (c) => <TabCard color={c} /> },
   { key: 'wallet',       label: 'کیف پول',        icon: (c) => <TabWallet color={c} /> },
   { key: 'notes',        label: 'یادداشت‌ها',     icon: (c) => <DocumentTextIcon style={{ width: 18, color: c }} /> },