fix(ClientBlack): 支持删除未生效黑名单记录

- 未提交、新增已拒绝的黑名单记录可直接删除，不进入删除审批
- 已加入、删除已拒绝仍按原逻辑发起删除审批
- 新增审批中、删除审批中仍禁止删除
- 补充未生效状态可直接删除的状态机单测，45/45 通过

UnitTestProject/Modules/ClientModule/ClientBlackApprovalPolicyTests.cs

@@ -41,6 +41,18 @@ namespace YLErp.Modules.ClientModule.Tests
             Assert.AreEqual(expected, ClientBlackApprovalPolicy.CanRequestRemoval(state));
         }
 
+        [DataTestMethod]
+        [DataRow(client_black.未提交, true)]
+        [DataRow(client_black.新增已拒绝, true)]
+        [DataRow(client_black.新增审批中, false)]
+        [DataRow(client_black.已加入, false)]
+        [DataRow(client_black.删除审批中, false)]
+        [DataRow(client_black.删除已拒绝, false)]
+        public void CanDeleteDraft_OnlyNeverEffectiveStatesCanDeleteDirectly(string state, bool expected)
+        {
+            Assert.AreEqual(expected, ClientBlackApprovalPolicy.CanDeleteDraft(state));
+        }
+
         [DataTestMethod]
         [DataRow(client_black.新增审批中, 1, true)]
         [DataRow(client_black.删除审批中, 1, true)]