🐛 fix(contract): 移除续签页面中重复的续签编号输入框

- 删除合同续签页面中多余的续签编号表单项，解决重复输入问题
- 保留其他表单字段结构，维持页面原有功能完整性

src/client/admin/pages/ContractRenews.tsx

@@ -427,14 +427,6 @@ const ContractRenews: React.FC = () => {
             <ContractSelect placeholder="选择合同" style={{ width: '100%' }} />
           </Form.Item>
           
-          <Form.Item
-            name=""
-            label="续签编号"
-            rules={[{ required: true, message: '请输入续签编号' }]}
-          >
-            <Input placeholder="请输入续签编号" disabled={!!currentRecord} />
-          </Form.Item>
-          
           <div className="grid grid-cols-2 gap-4">
             <Form.Item
               name=""