fix: resolve Spring Boot 4 CI failures and DeepSeek reasoning_content error

- Recreate AppHealthControllerTest using WebTestClient.bindToController() (@WebFluxTest removed in SB4)
- Fix DeepSeek thinking mode: pass reasoningContent via DeepSeekAssistantMessage in history
- Remove duplicate aws-java-sdk-s3 dependency in pom.xml

Author: MingGH

pom.xml

@@ -66,12 +66,6 @@
             <scope>provided</scope>
         </dependency>
 
-        <dependency>
-            <groupId>com.amazonaws</groupId>
-            <artifactId>aws-java-sdk-s3</artifactId>
-            <version>1.12.701</version>
-        </dependency>
-
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-r2dbc</artifactId>

src/main/java/run/runnable/kage/service/DeepSeekService.java

@@ -344,12 +344,15 @@ private List<Message> buildMessages(List<ChatMessage> history, String userMessag
             if ("user".equals(msg.getRole())) {
                 messages.add(new UserMessage(msg.getContent()));
             } else if ("assistant".equals(msg.getRole())) {
-                // DeepSeek V4 thinking 模型：如果有 reasoning_content，使用 DeepSeekAssistantMessage
-                // 注意：Spring AI 1.1.0 的 DeepSeekChatModel.createRequest() 有 bug，
-                // 它在构造 ChatCompletionMessage 时没有传递 reasoningContent 参数。
-                // 所以即使我们传了 DeepSeekAssistantMessage，也不会被序列化到请求中。
-                // 解决方案：暂时不使用 DeepSeekAssistantMessage，等 Spring AI 修复后再启用。
-                messages.add(new AssistantMessage(msg.getContent()));
+                String reasoningContent = msg.getReasoningContent();
+                if (reasoningContent != null && !reasoningContent.isEmpty()) {
+                    messages.add(DeepSeekAssistantMessage.builder()
+                            .content(msg.getContent())
+                            .reasoningContent(reasoningContent)
+                            .build());
+                } else {
+                    messages.add(new AssistantMessage(msg.getContent()));
+                }
             }
         });
 

src/test/java/run/runnable/kage/controller/AppHealthControllerTest.java

@@ -0,0 +1,28 @@
+package run.runnable.kage.controller;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.test.util.ReflectionTestUtils;
+import org.springframework.test.web.reactive.server.WebTestClient;
+
+class AppHealthControllerTest {
+
+    @Test
+    void testHealthCheck() {
+        AppHealthController controller = new AppHealthController();
+        ReflectionTestUtils.setField(controller, "version", "0.0.1-SNAPSHOT");
+
+        WebTestClient.bindToController(controller)
+                .build()
+                .get()
+                .uri("/hl/check")
+                .exchange()
+                .expectStatus().isOk()
+                .expectBody()
+                .jsonPath("$.status").isEqualTo(200)
+                .jsonPath("$.message").isEqualTo("Success")
+                .jsonPath("$.data").value(data -> {
+                    assert data instanceof String;
+                    assert ((String) data).contains("I am fine");
+                });
+    }
+}