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/locales/zh.json

@@ -594,7 +594,9 @@
         "description": "描述",
         "descriptionPlaceholder": "请介绍您的受众以及推广计划...",
         "expectedReferrals": "预计每月推荐数",
-        "expectedReferralsPlaceholder": "每月预估数量"
+        "expectedReferralsPlaceholder": "每月预估数量",
+        "desiredCommission": "期望佣金比例 (%)",
+        "desiredCommissionPlaceholder": "1 到 100%"
       }
     },
     "withdrawal": {
@@ -615,9 +617,9 @@
       "submitRequest": "提交请求",
       "requestError": "创建提现请求失败，请重试。",
       "fields": {
-        "amount": "金额（戈比）",
-        "amountPlaceholder": "输入金额（戈比）",
-        "amountHint": "请输入戈比金额（100戈比 = 1 {{currency}}）",
+        "amount": "金额",
+        "amountPlaceholder": "输入金额（{{currency}}）",
+        "amountHint": "最低：{{min}} {{currency}}",
         "paymentDetails": "付款信息",
         "paymentDetailsPlaceholder": "银行卡号、钱包地址或其他付款信息..."
       },
@@ -1728,6 +1730,7 @@
         "balance": "余额",
         "totalReferrals": "总推荐数",
         "totalEarnings": "总收益",
+        "requestedAmount": "请求金额",
         "createdAt": "创建时间",
         "paymentDetails": "付款信息",
         "noPaymentDetails": "未提供付款信息",
@@ -1783,7 +1786,8 @@
         "website": "网站",
         "channel": "频道",
         "description": "描述",
-        "expectedReferrals": "预计每月推荐数"
+        "expectedReferrals": "预计每月推荐数",
+        "desiredCommission": "期望佣金"
       },
       "approveDialog": {
         "title": "批准申请",