refactor(ff-game): 修改 GameExchangeBalanceRequest 中金额的最小值校验

- 将 @Min 注解替换为 @DecimalMin，以支持浮点数的最小值校验
- 修改最小值从1 调整为 0.1，以适应更灵活的金额输入

ff-game/src/main/java/com/ff/api/request/GameExchangeBalanceRequest.java

@@ -4,10 +4,7 @@ import com.ff.base.annotation.Excel;
 import lombok.Data;
 import org.hibernate.validator.constraints.Length;
 
-import javax.validation.constraints.Max;
-import javax.validation.constraints.Min;
-import javax.validation.constraints.NotBlank;
-import javax.validation.constraints.NotNull;
+import javax.validation.constraints.*;
 import java.io.Serializable;
 import java.math.BigDecimal;
 
@@ -46,7 +43,7 @@ public class GameExchangeBalanceRequest implements Serializable {
      * 金额
      */
     @NotNull(message = "amount不能为空")
-    @Min(value = 1, message = "amount最小值为1")
+    @DecimalMin(value = "0.1", message = "amount必须大于等于0.1")
     @Max(value = 999999999, message = "amount最大值为999999999")
     private BigDecimal amount;