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

addons/kefu/library/WechatCrypto/ErrorCode.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace addons\kefu\library\WechatCrypto;
+
+/**
+ * error code 说明.
+ * <ul>
+ *    <li>-40001: 签名验证错误</li>
+ *    <li>-40002: xml解析失败</li>
+ *    <li>-40003: sha加密生成签名失败</li>
+ *    <li>-40004: encodingAesKey 非法</li>
+ *    <li>-40005: appid 校验错误</li>
+ *    <li>-40006: aes 加密失败</li>
+ *    <li>-40007: aes 解密失败</li>
+ *    <li>-40008: 解密后得到的buffer非法</li>
+ *    <li>-40009: base64加密失败</li>
+ *    <li>-40010: base64解密失败</li>
+ *    <li>-40011: 生成xml失败</li>
+ * </ul>
+ */
+class ErrorCode
+{
+    public static $OK                     = 0;
+    public static $ValidateSignatureError = -40001;
+    public static $ParseXmlError          = -40002;
+    public static $ComputeSignatureError  = -40003;
+    public static $IllegalAesKey          = -40004;
+    public static $ValidateAppidError     = -40005;
+    public static $EncryptAESError        = -40006;
+    public static $DecryptAESError        = -40007;
+    public static $IllegalBuffer          = -40008;
+    public static $EncodeBase64Error      = -40009;
+    public static $DecodeBase64Error      = -40010;
+    public static $GenReturnXmlError      = -40011;
+}
+
+?>