fix: 开放接口支持模糊匹配项目名，添加 TtFile 导入

- TtCodeMapper.xml: selectTtCodeByCodeName 改为模糊匹配
- TtCopyTemplateController: 添加 TtFile import，var 改为显式类型

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ruoyi-office/src/main/resources/mapper/office/TtCodeMapper.xml

@@ -46,7 +46,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 
     <select id="selectTtCodeByCodeName" parameterType="String" resultMap="TtCodeResult">
         <include refid="selectTtCodeVo"/>
-        where code_name = #{codeName} limit 1
+        where code_name = #{codeName} or code_name like concat('%', #{codeName}, '%') limit 1
     </select>
         
     <insert id="insertTtCode" parameterType="TtCode">