feat: add signed PostgreSQL release updates

oa-backend/src/main/java/com/kaidi/oa/domain/PmtInternalTrans.java

@@ -39,7 +39,7 @@ public class PmtInternalTrans {
     private BigDecimal amount = BigDecimal.ZERO;
 
     /** 利率（内部计息时使用，年化，如 3.5 表示 3.5%）。 */
-    private Double interestRate;
+    private BigDecimal interestRate;
 
     /** 计息起始日。 */
     private String interestFrom;
@@ -104,8 +104,8 @@ public class PmtInternalTrans {
     public BigDecimal getAmount() { return amount; }
     public void setAmount(BigDecimal amount) { this.amount = amount; }
 
-    public Double getInterestRate() { return interestRate; }
-    public void setInterestRate(Double interestRate) { this.interestRate = interestRate; }
+    public BigDecimal getInterestRate() { return interestRate; }
+    public void setInterestRate(BigDecimal interestRate) { this.interestRate = interestRate; }
 
     public String getInterestFrom() { return interestFrom; }
     public void setInterestFrom(String interestFrom) { this.interestFrom = interestFrom; }