refactor(knowledge): 重构大模型配置

Spring AI默认大模型配置不支持同时配置两个文本大模型，比如一个文本大模型和一个图像大模型，改用自定义的配置

service-ai/service-ai-knowledge/pom.xml

@@ -26,6 +26,10 @@
             <groupId>org.springframework.ai</groupId>
             <artifactId>spring-ai-starter-model-openai</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.springframework.ai</groupId>
+            <artifactId>spring-ai-starter-model-deepseek</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.ai</groupId>
             <artifactId>spring-ai-starter-vector-store-qdrant</artifactId>