feat: 添加MiniMax作为LLM提供商，合并PR#280并补充监听

合并PR#280的MiniMax provider实现，解决与main分支的冲突，
并在MinimaxServiceImpl中补充MyChatModelListener监听，
与其他provider保持一致。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ruoyi-modules/ruoyi-chat/pom.xml

@@ -173,6 +173,21 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-junit-jupiter</artifactId>
+            <scope>test</scope>
+        </dependency>
 
     </dependencies>