feat: 引入循环交易管理、邮件通知和用户设置功能

internal/config/config.go

@@ -73,6 +73,13 @@ type Config struct {
 	AliyunAccessKeySecret string
 	AliyunSignName        string
 	AliyunTemplateCode    string
+
+	// SMTP Configuration (Email)
+	SMTPHost     string
+	SMTPPort     int
+	SMTPUser     string
+	SMTPPassword string
+	SMTPFrom     string
 }
 
 // Load loads configuration from environment variables
@@ -143,6 +150,13 @@ func Load() *Config {
 		AliyunAccessKeySecret: getEnv("ALIYUN_ACCESS_KEY_SECRET", ""),
 		AliyunSignName:        getEnv("ALIYUN_SIGN_NAME", ""),
 		AliyunTemplateCode:    getEnv("ALIYUN_TEMPLATE_CODE", ""),
+
+		// SMTP
+		SMTPHost:     getEnv("SMTP_HOST", ""),
+		SMTPPort:     getEnvInt("SMTP_PORT", 587),
+		SMTPUser:     getEnv("SMTP_USER", ""),
+		SMTPPassword: getEnv("SMTP_PASSWORD", ""),
+		SMTPFrom:     getEnv("SMTP_FROM", ""),
 	}
 
 	// Ensure data directory exists