fix: partner system bugs - commission field, withdrawal UX, admin amount

1. Add desired commission percent field to partner application form
   and admin review page (Bug 1)
2. Add prominent "Requested Amount" row in admin withdrawal detail (Bug 2)
3. Switch withdrawal input from kopecks to rubles with auto-conversion
   on submit (Bug 3)

Includes i18n updates for all 4 locales (ru, en, zh, fa).

src/pages/ReferralPartnerApply.tsx

@@ -15,6 +15,7 @@ export default function ReferralPartnerApply() {
     telegram_channel: '',
     description: '',
     expected_monthly_referrals: undefined,
+    desired_commission_percent: undefined,
   });
 
   // Guard: redirect if already approved or pending
@@ -50,6 +51,9 @@ export default function ReferralPartnerApply() {
     if (form.expected_monthly_referrals) {
       payload.expected_monthly_referrals = form.expected_monthly_referrals;
     }
+    if (form.desired_commission_percent) {
+      payload.desired_commission_percent = form.desired_commission_percent;
+    }
     applyMutation.mutate(payload);
   };
 
@@ -126,6 +130,25 @@ export default function ReferralPartnerApply() {
               placeholder={t('referral.partner.fields.expectedReferralsPlaceholder')}
             />
           </div>
+          <div>
+            <label className="mb-1 block text-sm font-medium text-dark-300">
+              {t('referral.partner.fields.desiredCommission')}
+            </label>
+            <input
+              type="number"
+              min={1}
+              max={100}
+              className="input w-full"
+              value={form.desired_commission_percent ?? ''}
+              onChange={(e) =>
+                setForm({
+                  ...form,
+                  desired_commission_percent: e.target.value ? Number(e.target.value) : undefined,
+                })
+              }
+              placeholder={t('referral.partner.fields.desiredCommissionPlaceholder')}
+            />
+          </div>
         </div>
 
         {applyMutation.isError && (