fix: 修复遗漏的 backend-single 引用（Java源码/前端注释/配置文件/IDE配置）

server/src/main/java/com/emotion/EmotionSimpleApplication.java

@@ -23,7 +23,7 @@ public class EmotionSimpleApplication {
         System.out.println("========================================");
         System.out.println("🎉 情感博物馆服务启动成功！");
         System.out.println("📋 服务信息:");
-        System.out.println("  - 服务名称: backend-single");
+        System.out.println("  - 服务名称: server");
         System.out.println("  - 服务端口: 19089");
         System.out.println("  - 环境配置: " + System.getProperty("spring.profiles.active"));
         System.out.println("  - API文档: http://localhost:19089/api/health");

server/src/main/java/com/emotion/controller/HealthController.java

@@ -32,7 +32,7 @@ public class HealthController {
         log.info("健康检查请求");
         
         Map<String, Object> response = new HashMap<>();
-        response.put("service", "backend-single");
+        response.put("service", "server");
         response.put("message", "情感博物馆单体服务运行正常");
         response.put("version", "1.0.0");
         response.put("status", "UP");
@@ -50,7 +50,7 @@ public class HealthController {
         log.info("服务信息请求");
         
         Map<String, Object> response = new HashMap<>();
-        response.put("service", "backend-single");
+        response.put("service", "server");
         response.put("description", "情感博物馆单体服务");
         response.put("version", "1.0.0");
         response.put("author", "emotion-museum");