feat(settings): 移除单位美元额度设置项，为后续修改作准备

web/src/pages/Setting/Operation/SettingsGeneral.jsx

@@ -130,17 +130,19 @@ export default function GeneralSettings(props) {
                   showClear
                 />
               </Col>
-              <Col xs={24} sm={12} md={8} lg={8} xl={8}>
-                <Form.Input
-                  field={'QuotaPerUnit'}
-                  label={t('单位美元额度')}
-                  initValue={''}
-                  placeholder={t('一单位货币能兑换的额度')}
-                  onChange={handleFieldChange('QuotaPerUnit')}
-                  showClear
-                  onClick={() => setShowQuotaWarning(true)}
-                />
-              </Col>
+              {inputs.QuotaPerUnit !== '500000' && inputs.QuotaPerUnit !== 500000 && (
+                <Col xs={24} sm={12} md={8} lg={8} xl={8}>
+                  <Form.Input
+                    field={'QuotaPerUnit'}
+                    label={t('单位美元额度')}
+                    initValue={''}
+                    placeholder={t('一单位货币能兑换的额度')}
+                    onChange={handleFieldChange('QuotaPerUnit')}
+                    showClear
+                    onClick={() => setShowQuotaWarning(true)}
+                  />
+                </Col>
+              )}
               <Col xs={24} sm={12} md={8} lg={8} xl={8}>
                 <Form.Input
                   field={'USDExchangeRate'}