fix: 修复DTO工号验证规范问题

- 申请人工号验证从@Size改为@Pattern正则表达式
- 采购负责人工号验证从@Size改为@Pattern正则表达式
- 统一使用7位数字格式验证（^\d{7}$）

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

ruoyi-ccdi/src/main/java/com/ruoyi/ccdi/domain/dto/CcdiPurchaseTransactionAddDTO.java

@@ -165,7 +165,7 @@ public class CcdiPurchaseTransactionAddDTO implements Serializable {
 
     /** 申请人工号 */
     @NotBlank(message = "申请人工号不能为空")
-    @Size(max = 7, message = "申请人工号长度不能超过7个字符")
+    @Pattern(regexp = "^\\d{7}$", message = "申请人工号必须为7位数字")
     @Schema(description = "申请人工号")
     private String applicantId;
 
@@ -182,7 +182,7 @@ public class CcdiPurchaseTransactionAddDTO implements Serializable {
     private String applyDepartment;
 
     /** 采购负责人工号 */
-    @Size(max = 7, message = "采购负责人工号长度不能超过7个字符")
+    @Pattern(regexp = "^\\d{7}$", message = "采购负责人工号必须为7位数字")
     @Schema(description = "采购负责人工号")
     private String purchaseLeaderId;
 

ruoyi-ccdi/src/main/java/com/ruoyi/ccdi/domain/dto/CcdiPurchaseTransactionEditDTO.java

@@ -165,7 +165,7 @@ public class CcdiPurchaseTransactionEditDTO implements Serializable {
 
     /** 申请人工号 */
     @NotBlank(message = "申请人工号不能为空")
-    @Size(max = 7, message = "申请人工号长度不能超过7个字符")
+    @Pattern(regexp = "^\\d{7}$", message = "申请人工号必须为7位数字")
     @Schema(description = "申请人工号")
     private String applicantId;
 
@@ -182,7 +182,7 @@ public class CcdiPurchaseTransactionEditDTO implements Serializable {
     private String applyDepartment;
 
     /** 采购负责人工号 */
-    @Size(max = 7, message = "采购负责人工号长度不能超过7个字符")
+    @Pattern(regexp = "^\\d{7}$", message = "采购负责人工号必须为7位数字")
     @Schema(description = "采购负责人工号")
     private String purchaseLeaderId;