fix(test): 删除 AI 测试中不存在的 com.mangoo.rating.ai.model 错误 import

死代码 wildcard import，实际使用类已由后续 com.mangoo.rating.recommend.ai.model.* 覆盖；
导致 testCompile 失败、阻塞 OrderGrouperTest 验证。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

mango-application/src/test/java/com/mangoo/rating/recommend/test/ai/AgentLoopExecutorTest.java

@@ -1,7 +1,6 @@
 package com.mangoo.rating.recommend.test.ai;
 
 import com.mangoo.rating.recommend.ai.agent.AgentLoopExecutor;
-import com.mangoo.rating.ai.model.*;
 import com.mangoo.rating.recommend.ai.model.*;
 import com.mangoo.rating.recommend.ai.provider.ChatModelProvider;
 import com.mangoo.rating.recommend.ai.tool.ToolRegistry;

mango-application/src/test/java/com/mangoo/rating/recommend/test/ai/AiChatServiceTest.java

@@ -1,7 +1,6 @@
 package com.mangoo.rating.recommend.test.ai;
 
 import com.mangoo.rating.recommend.ai.agent.AgentLoopExecutor;
-import com.mangoo.rating.ai.model.*;
 import com.mangoo.rating.recommend.ai.model.ChatMessage;
 import com.mangoo.rating.recommend.ai.model.Role;
 import com.mangoo.rating.recommend.ai.service.AiChatService;