feat(pigx-flow-api): 新增流程状态事件发布订阅机制

- 新增 FlowStatusEventPublisher 用于发布流程状态变更事件到 Redis Channel
- 新增 FlowStatusEventListener 用于监听 Redis 消息并分发给匹配的事件服务
- 新增 IProcessInstanceStatusEventService 接口定义流程状态事件处理规范
- 新增 FlowStatusEventAutoConfiguration 自动配置类，实现事件发布者和监听器的 Bean 注册
- 重构 NodeTaskCompleteNotify 服务，使用事件发布机制替代直接调用事件服务
- 将 IProcessInstanceStatusEventService 接口移动到 flow-api 模块的 event 包下
- 在 pigx-flow-api 模块添加 spring-boot-starter-data-redis 依赖支持
- 更新相关服务的包引用和日期注释

pigx-flow/pigx-flow-api/src/main/java/com/pig4cloud/pigx/flow/config/FlowStatusEventAutoConfiguration.java

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+package com.pig4cloud.pigx.flow.config;
+
+import com.pig4cloud.pigx.flow.event.FlowStatusEventListener;
+import com.pig4cloud.pigx.flow.event.FlowStatusEventPublisher;
+import com.pig4cloud.pigx.flow.event.IProcessInstanceStatusEventService;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.data.redis.listener.ChannelTopic;
+import org.springframework.data.redis.listener.RedisMessageListenerContainer;
+
+import java.util.List;
+
+/**
+ * 流程状态事件自动配置
+ *
+ * @author lengleng
+ * @date 2026-02-10
+ */
+@AutoConfiguration
+@ConditionalOnClass(StringRedisTemplate.class)
+public class FlowStatusEventAutoConfiguration {
+
+	/**
+	 * 事件发布者 - 所有依赖 flow-api 的模块可用
+	 */
+	@Bean
+	@ConditionalOnMissingBean
+	public FlowStatusEventPublisher flowStatusEventPublisher(StringRedisTemplate redisTemplate) {
+		return new FlowStatusEventPublisher(redisTemplate);
+	}
+
+	/**
+	 * 事件监听器 - 仅当有 IProcessInstanceStatusEventService 实现时启用
+	 */
+	@Bean
+	@ConditionalOnMissingBean
+	@ConditionalOnBean(IProcessInstanceStatusEventService.class)
+	public FlowStatusEventListener flowStatusEventListener(List<IProcessInstanceStatusEventService> eventServices,
+			StringRedisTemplate redisTemplate) {
+		return new FlowStatusEventListener(eventServices, redisTemplate);
+	}
+
+	/**
+	 * 注册监听器到 Redis 容器
+	 */
+	@Bean
+	@ConditionalOnBean(FlowStatusEventListener.class)
+	public ChannelTopic flowStatusTopic(RedisMessageListenerContainer container, FlowStatusEventListener listener) {
+		ChannelTopic topic = new ChannelTopic(FlowStatusEventPublisher.CHANNEL);
+		container.addMessageListener(listener, topic);
+		return topic;
+	}
+
+}

pigx-flow/pigx-flow-api/src/main/java/com/pig4cloud/pigx/flow/event/FlowStatusEventListener.java

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+package com.pig4cloud.pigx.flow.event;
+
+import cn.hutool.json.JSONUtil;
+import com.pig4cloud.pigx.flow.dto.ProcessInstanceParamDto;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.redis.connection.Message;
+import org.springframework.data.redis.connection.MessageListener;
+import org.springframework.data.redis.core.StringRedisTemplate;
+
+import java.util.List;
+
+/**
+ * 流程状态事件监听器
+ * <p>
+ * 监听 Redis Channel，将事件分发给匹配的 IProcessInstanceStatusEventService 实现
+ * </p>
+ *
+ * @author lengleng
+ * @date 2026-02-10
+ */
+@Slf4j
+@RequiredArgsConstructor
+public class FlowStatusEventListener implements MessageListener {
+
+	private final List<IProcessInstanceStatusEventService> eventServices;
+
+	private final StringRedisTemplate redisTemplate;
+
+	@Override
+	public void onMessage(Message message, byte[] pattern) {
+		String body = redisTemplate.getStringSerializer().deserialize(message.getBody());
+		ProcessInstanceParamDto paramDto = JSONUtil.toBean(body, ProcessInstanceParamDto.class);
+
+		log.debug("收到流程状态事件: flowId={}, processInstanceId={}", paramDto.getFlowId(),
+				paramDto.getProcessInstanceId());
+
+		// 分发给匹配 flowId 的实现
+		for (IProcessInstanceStatusEventService service : eventServices) {
+			if (service.getFlowId().equals(paramDto.getFlowId())) {
+				try {
+					service.handleStatusEvent(paramDto);
+				}
+				catch (Exception e) {
+					log.error("处理流程状态事件失败: flowId={}, service={}", paramDto.getFlowId(),
+							service.getClass().getSimpleName(), e);
+				}
+			}
+		}
+	}
+
+}

pigx-flow/pigx-flow-api/src/main/java/com/pig4cloud/pigx/flow/event/FlowStatusEventPublisher.java

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+package com.pig4cloud.pigx.flow.event;
+
+import cn.hutool.json.JSONUtil;
+import com.pig4cloud.pigx.flow.dto.ProcessInstanceParamDto;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.data.redis.core.StringRedisTemplate;
+
+/**
+ * 流程状态事件发布者
+ * <p>
+ * 将流程状态变更事件发布到 Redis Channel
+ * </p>
+ *
+ * @author lengleng
+ * @date 2026-02-10
+ */
+@Slf4j
+@RequiredArgsConstructor
+public class FlowStatusEventPublisher {
+
+	public static final String CHANNEL = "pigx:flow:status";
+
+	private final StringRedisTemplate redisTemplate;
+
+	/**
+	 * 发布流程状态变更事件
+	 * @param paramDto 流程实例参数
+	 */
+	public void publish(ProcessInstanceParamDto paramDto) {
+		String message = JSONUtil.toJsonStr(paramDto);
+		redisTemplate.convertAndSend(CHANNEL, message);
+		log.debug("发布流程状态事件: flowId={}, processInstanceId={}", paramDto.getFlowId(),
+				paramDto.getProcessInstanceId());
+	}
+
+}

pigx-flow/pigx-flow-api/src/main/java/com/pig4cloud/pigx/flow/event/IProcessInstanceStatusEventService.java

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+package com.pig4cloud.pigx.flow.event;
+
+import com.pig4cloud.pigx.flow.dto.ProcessInstanceParamDto;
+
+/**
+ * 流程实例状态事件服务接口
+ * <p>
+ * 实现此接口以监听流程状态变更事件。
+ * 通过 Redis Pub/Sub 实现跨模块通知。
+ * </p>
+ *
+ * @author lengleng
+ * @date 2026-02-10
+ */
+public interface IProcessInstanceStatusEventService {
+
+	/**
+	 * 获取监听的流程定义Key
+	 * @return 监听的流程定义Key
+	 */
+	String getFlowId();
+
+	/**
+	 * 处理状态事件
+	 * @param paramDto 流程实例参数DTO
+	 */
+	void handleStatusEvent(ProcessInstanceParamDto paramDto);
+
+}