feat: admin partner settings page, partner section visibility toggle, custom requisites text

- New AdminPartnerSettings page with validation (pattern from AdminTicketSettings)
- Settings gear button on AdminPartners header
- Hide partner/withdrawal sections when partner_section_visible is false
- Use custom requisites_text as label in withdrawal form
- i18n keys for ru/en

src/pages/ReferralWithdrawalRequest.tsx

@@ -83,7 +83,7 @@ export default function ReferralWithdrawalRequest() {
           </div>
           <div>
             <label className="mb-1 block text-sm font-medium text-dark-300">
-              {t('referral.withdrawal.fields.paymentDetails')}
+              {balance?.requisites_text || t('referral.withdrawal.fields.paymentDetails')}
             </label>
             <textarea
               className="input min-h-[80px] w-full"