refactor(domain): 将删除和恢复逻辑移至基类并实现幂等性

将SysUser、SysRole和SysPermission中的删除和恢复方法移至BaseDomain
实现删除操作的幂等性，已删除对象不会重复更新删除时间
更新测试用例以验证幂等行为

gym-manage-api/manage-sys/src/main/java/cn/novalon/gym/manage/sys/core/domain/BaseDomain.java

@@ -76,10 +76,29 @@ public abstract class BaseDomain {
         return this.id;
     }
 
+    /**
+     * 删除（幂等操作）
+     * 已删除的对象不会更新删除时间
+     */
+    public void delete() {
+        if (this.deletedAt == null) {
+            this.deletedAt = LocalDateTime.now();
+        }
+    }
+
+    /**
+     * 恢复已删除的对象
+     */
+    public void restore() {
+        this.deletedAt = null;
+    }
+
     @Override
     public boolean equals(Object o) {
-        if (this == o) return true;
-        if (o == null || getClass() != o.getClass()) return false;
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
         BaseDomain that = (BaseDomain) o;
         return id != null && id.equals(that.id);
     }

gym-manage-api/manage-sys/src/main/java/cn/novalon/gym/manage/sys/core/domain/SysPermission.java

@@ -77,18 +77,4 @@ public class SysPermission extends BaseDomain {
     public void setStatus(Integer status) {
         this.status = status;
     }
-
-    /**
-     * 删除权限
-     */
-    public void delete() {
-        this.deletedAt = java.time.LocalDateTime.now();
-    }
-
-    /**
-     * 恢复权限
-     */
-    public void restore() {
-        this.deletedAt = null;
-    }
 }

gym-manage-api/manage-sys/src/main/java/cn/novalon/gym/manage/sys/core/domain/SysRole.java

@@ -57,18 +57,4 @@ public class SysRole extends BaseDomain {
     public void setStatus(Integer status) {
         this.status = status;
     }
-
-    /**
-     * 删除角色
-     */
-    public void delete() {
-        this.deletedAt = LocalDateTime.now();
-    }
-
-    /**
-     * 恢复角色
-     */
-    public void restore() {
-        this.deletedAt = null;
-    }
 }

gym-manage-api/manage-sys/src/main/java/cn/novalon/gym/manage/sys/core/domain/SysUser.java

@@ -100,11 +100,4 @@ public class SysUser extends BaseDomain {
     public void setStatus(Integer status) {
         this.status = status;
     }
-
-    /**
-     * 删除用户
-     */
-    public void delete() {
-        this.deletedAt = LocalDateTime.now();
-    }
 }

gym-manage-api/manage-sys/src/test/java/cn/novalon/gym/manage/sys/core/domain/SysUserTest.java

@@ -59,7 +59,7 @@ class SysUserTest {
 
         assertNotNull(firstDeleteTime);
         assertNotNull(secondDeleteTime);
-        assertNotEquals(firstDeleteTime, secondDeleteTime);
+        assertEquals(firstDeleteTime, secondDeleteTime);
     }
 
     @Test