Add a doctor/clinic settings sub-navigation shell (SettingsLayout) with
"خرید اشتراک" as its first section, plus a mobile settings-list page.
Rebuild the plan-selection page with a per-plan billing-period toggle,
single price, most-popular badge and a current-plan status banner.
Add a payment-success page that reads the gateway return params
(?payment_uuid&status), shows the transaction receipt and the newly
active plan, and redirects to the plans page with a toast on any
non-success status.
Frontend only — reuses the existing /api/v1/subscription/* and
/api/v1/subscription-payment endpoints; no backend or API-doc changes.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
