feat(i18n): enhance locale support for rebate settings and report exports

- Updated English, Nepali, and Chinese locale files to include new translations for the "apply rebate to payout" feature, enhancing clarity on its functionality.
- Added new export options for previewing CSV and Excel files in reports, improving user experience with clearer export capabilities.
- Enhanced internationalization support across multiple locales to ensure consistent messaging in the admin interface.

src/i18n/locales/zh/config.json

@@ -115,6 +115,7 @@
       "autoSettlement": "自动执行结算",
       "autoApprove": "自动审核结算批次",
       "autoPayout": "自动派彩入账",
+      "applyRebateToPayout": "中奖注单结算时再扣回水",
       "playRulesHtml": "玩法规则 HTML（多语言）",
       "playRulesHtmlDesc": "该内容将直接在玩家端的玩法规则页面作为 HTML 渲染。按语言分别配置；留空则回退其它语言或显示默认提示。"
     },
@@ -123,7 +124,8 @@
       "cooldownMinutes": "结果发布后等待多久再进入 settling。填 0 表示发布后直接进入结算。",
       "autoSettlement": "关闭后，tick 不会自动跑结算，只能由后台手工执行。",
       "autoApprove": "冷静期结束并跑完结算后，是否自动将批次标记为已审核。",
-      "autoPayout": "批次已审核后，是否由 tick 自动把中奖金额打入玩家钱包。"
+      "autoPayout": "批次已审核后，是否由 tick 自动把中奖金额打入玩家钱包。",
+      "applyRebateToPayout": "开启后派彩金额 = 毛赢 × (1 - 回水率快照)。默认关闭（下注实扣已体现回水）。"
     },
     "states": {
       "enabled": "已开启",
@@ -333,9 +335,11 @@
       "d4": "4D 回水比例 (%)"
     },
     "winEnjoy": {
-      "label": "中奖注单也应用回水",
-      "description": "这是预留字段，后续可和风控、结算规则对齐后再真正落库存储。",
-      "pendingNote": "产品要求支持该开关，但后端尚未提供配置字段；当前仅展示说明，无法在此修改。"
+      "label": "中奖注单结算时再扣回水",
+      "description": "对应系统参数 settlement.apply_rebate_to_payout：开启后中奖派彩在毛赢基础上再乘 (1 - 回水率快照)。",
+      "hint": "全局开关，保存后立即影响后续结算派彩，不随赔率版本发布。",
+      "saveSuccess": "已更新中奖回水结算开关",
+      "saveFailed": "更新失败"
     },
     "effectiveTime": "生效时间（当前赔率生效版本）"
   },

src/i18n/locales/zh/reports.json

@@ -24,8 +24,11 @@
     "csv": "CSV",
     "excel": "Excel",
     "csvServer": "导出 CSV（全量）",
-    "excelServer": "导出 Excel（全量）"
+    "excelServer": "导出 Excel（全量）",
+    "csvPreview": "导出当前页 CSV",
+    "excelPreview": "导出当前页 Excel"
   },
+  "exportPreviewHint": "仅导出当前预览表格中的数据（受分页限制）",
   "tasks": {
     "refresh": "刷新",
     "download": "下载",