feat: 后端全量更新 - 含所有本次需求

- Contract.php: 返回合约账户余额(balance_contract)
- My.php: 地址管理增加BTC/ETH
- AppContract.php: 一键平仓(closeall)
- AppProxy.php: 代理专属注册链接 + 分级权限(L1/L2)
- site.php: 手续费减半(0.018→0.009)
- agent_permission_setup.sql: 代理权限SQL
- crypto_news_crawler.py: 新闻自动采集脚本

application/api/lang/ms/contract.php

@@ -0,0 +1,26 @@
+<?php
+
+return [
+    "请先完成实名认证" => "Sila Lengkapkan Pengesahan KYC",
+    "请选择交易模式" => "Pilih Jenis Dagangan",
+    "限价模式，请输入价格" => "Terhad，Masukkan Harga",
+    "请选择交易币种" => "Pilih Token",
+    "该交易币种已下架或不存在" => "Token Tidak Tersedia",
+    "请选择交易方向" => "Sila Pilih Sebelah",
+    "请输入交易数量" => "Sila Masukkan Jumlah",
+    "请选择交易倍数" => "Sila Pilih Pelakon",
+    "请选择正确的交易倍数" => "Cast Pilihan Tidak Sah",
+    "操作频繁" => "Operasi Kerap",
+    "账号余额不足" => "Baki Rendah",
+    "系统繁忙" => "Sistem Belum Selesai",
+    "提交成功" => "Berjaya",
+    "请选择设置的合约订单" => "Sila Pilih Pesanan Niaga Hadapan telah Ditetapkan",
+    "合约订单不存在或已平仓" => "Pesanan Tidak Tersedia atau Ditutup",
+    "请设置止盈价格" => "Sila Tetapkan Harga Takeprofit",
+    "请设置止损价格" => "Sila Tetapkan Harga Henti Kerugian",
+    "设置成功" => "alternatif",
+    "请选择合约订单" => "Sila Pesanan Niaga Hadapan",
+    "已平仓" => "tertutup",
+    "已撤销" => "Dibatalkan",
+    "未查询到币种信息" => "tidak sah",
+];