feat: 开源准备和功能优化

- 添加 MIT 许可证
- 创建完整的项目 README.md
- 前端添加 GitHub 和 Twitter 链接
- 重构表名：copy_trading_accounts -> wallet_accounts
  - 更新 Account 实体类
  - 添加数据库迁移脚本 V3
  - 更新初始化脚本和文档
- 优化跟单订单类型：GTC -> FAK
  - 买入和卖出订单均使用 FAK (Fill-And-Kill)
  - 允许部分成交，未成交部分立即取消
  - 提高跟单响应速度和价格匹配准确性

backend/src/main/kotlin/com/wrbug/polymarketbot/entity/Account.kt

@@ -4,10 +4,10 @@ import jakarta.persistence.*
 
 /**
  * 账户信息实体
- * 用于存储跟单者的账户信息（支持多账户）
+ * 用于存储钱包账户信息（支持多账户）
  */
 @Entity
-@Table(name = "copy_trading_accounts")
+@Table(name = "wallet_accounts")
 data class Account(
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)

backend/src/main/kotlin/com/wrbug/polymarketbot/service/CopyOrderTrackingService.kt

@@ -461,10 +461,12 @@ class CopyOrderTrackingService(
         }
         
         // 8. 构建订单请求
+        // 跟单订单使用 FAK (Fill-And-Kill)，允许部分成交，未成交部分立即取消
+        // 这样可以快速响应 Leader 的交易，避免订单长期挂单导致价格不匹配
         val orderRequest = NewOrderRequest(
             order = signedOrder,
             owner = account.apiKey!!,
-            orderType = "GTC",  // Good-Til-Cancelled
+            orderType = "FAK",  // Fill-And-Kill
             deferExec = false
         )
         
@@ -584,10 +586,12 @@ class CopyOrderTrackingService(
                 )
                 
                 // 构建订单请求（每次重试都使用新签名的订单）
+                // 跟单订单使用 FAK (Fill-And-Kill)，允许部分成交，未成交部分立即取消
+                // 这样可以快速响应 Leader 的交易，避免订单长期挂单导致价格不匹配
                 val orderRequest = NewOrderRequest(
                     order = signedOrder,
                     owner = owner,  // API Key
-                    orderType = "GTC",  // Good-Til-Cancelled
+                    orderType = "FAK",  // Fill-And-Kill
                     deferExec = false
                 )
                 

backend/src/main/resources/db/migration/V1__init_database.sql

@@ -5,7 +5,7 @@
 -- ============================================
 -- 1. 创建账户表
 -- ============================================
-CREATE TABLE IF NOT EXISTS copy_trading_accounts (
+CREATE TABLE IF NOT EXISTS wallet_accounts (
     id BIGINT AUTO_INCREMENT PRIMARY KEY,
     private_key VARCHAR(500) NOT NULL COMMENT '私钥（加密存储）',
     wallet_address VARCHAR(42) NOT NULL UNIQUE COMMENT '钱包地址（从私钥推导）',
@@ -20,7 +20,7 @@ CREATE TABLE IF NOT EXISTS copy_trading_accounts (
     updated_at BIGINT NOT NULL COMMENT '更新时间（毫秒时间戳）',
     INDEX idx_wallet_address (wallet_address),
     INDEX idx_is_default (is_default)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='跟单系统账户表';
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='钱包账户表';
 
 -- ============================================
 -- 2. 创建被跟单者（Leader）表
@@ -77,7 +77,7 @@ CREATE TABLE IF NOT EXISTS copy_trading (
     INDEX idx_template_id (template_id),
     INDEX idx_leader_id (leader_id),
     INDEX idx_enabled (enabled),
-    FOREIGN KEY (account_id) REFERENCES copy_trading_accounts(id) ON DELETE CASCADE,
+    FOREIGN KEY (account_id) REFERENCES wallet_accounts(id) ON DELETE CASCADE,
     FOREIGN KEY (template_id) REFERENCES copy_trading_templates(id) ON DELETE RESTRICT,
     FOREIGN KEY (leader_id) REFERENCES copy_trading_leaders(id) ON DELETE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='跟单关系表（钱包-模板关联）';

backend/src/main/resources/db/migration/V3__rename_copy_trading_accounts_to_wallet_accounts.sql

@@ -0,0 +1,36 @@
+-- ============================================
+-- 重命名账户表：copy_trading_accounts -> wallet_accounts
+-- ============================================
+
+-- 检查表是否存在，如果存在则重命名
+-- 注意：此迁移脚本假设表已经存在（从 V1 迁移创建）
+
+-- 1. 查找外键约束名称并删除
+SET @fk_name = NULL;
+SELECT CONSTRAINT_NAME INTO @fk_name
+FROM information_schema.KEY_COLUMN_USAGE 
+WHERE TABLE_SCHEMA = DATABASE() 
+  AND TABLE_NAME = 'copy_trading' 
+  AND COLUMN_NAME = 'account_id' 
+  AND REFERENCED_TABLE_NAME = 'copy_trading_accounts'
+LIMIT 1;
+
+-- 2. 如果找到外键，删除它
+SET @drop_fk_sql = IF(@fk_name IS NOT NULL, 
+    CONCAT('ALTER TABLE copy_trading DROP FOREIGN KEY `', @fk_name, '`'), 
+    'SELECT 1');
+PREPARE stmt FROM @drop_fk_sql;
+EXECUTE stmt;
+DEALLOCATE PREPARE stmt;
+
+-- 3. 重命名表
+RENAME TABLE copy_trading_accounts TO wallet_accounts;
+
+-- 4. 重新添加外键约束
+ALTER TABLE copy_trading 
+ADD CONSTRAINT fk_copy_trading_account_id 
+FOREIGN KEY (account_id) REFERENCES wallet_accounts(id) ON DELETE CASCADE;
+
+-- 5. 更新表注释
+ALTER TABLE wallet_accounts COMMENT = '钱包账户表';
+