feat(examples): 移除设备和问卷集成示例代码

- 删除默认配置集成服务使用示例类- 移除设备配置筛选功能使用示例
- 清理设备集成基础操作示例代码
- 移除设备集成降级机制示例
- 删除Kafka集成使用示例
- 清理问卷集成服务示例代码

src/main/java/com/ycwl/basic/integration/kafka/example/KafkaIntegrationExample.java

@@ -1,57 +0,0 @@
-package com.ycwl.basic.integration.kafka.example;
-
-import com.ycwl.basic.integration.kafka.dto.KafkaMessage;
-import com.ycwl.basic.integration.kafka.service.KafkaIntegrationService;
-import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
-import org.springframework.stereotype.Component;
-
-/**
- * Kafka集成使用示例（暂时注释，后续开发时启用）
- */
-@Slf4j
-@Component
-@RequiredArgsConstructor
-@ConditionalOnProperty(name = "kafka.example.enabled", havingValue = "true", matchIfMissing = false)
-public class KafkaIntegrationExample {
-
-    private final KafkaIntegrationService kafkaService;
-
-    /**
-     * 演示Kafka连接测试
-     */
-    public void demonstrateConnectionTest() {
-        log.info("=== Kafka Integration Example ===");
-        
-        // 测试连接
-        boolean connected = kafkaService.testConnection();
-        log.info("Kafka connection status: {}", connected ? "SUCCESS" : "FAILED");
-        
-        // 显示配置信息
-        var properties = kafkaService.getKafkaProperties();
-        log.info("Kafka Bootstrap Servers: {}", properties.getBootstrapServers());
-        log.info("Consumer Group ID: {}", properties.getConsumer().getGroupId());
-    }
-
-    /**
-     * 演示消息发送（预留示例）
-     */
-    public void demonstrateMessageSending() {
-        log.info("=== Message Sending Example (Not Implemented) ===");
-        
-        // 创建示例消息
-        KafkaMessage<String> message = KafkaMessage.of(
-            "test-topic", 
-            "TEST_EVENT", 
-            "Hello Kafka from liuying-microservice!"
-        );
-        
-        // 发送消息（暂不实现）
-        kafkaService.sendMessage("test-topic", "test-key", message);
-        log.info("Message sending demonstration completed");
-    }
-
-    // TODO: 后续添加消费者示例
-    // public void demonstrateMessageConsuming() { ... }
-}