feat: 落地聊天记录异步持久化基础设施

- 新增 chatlog 模块、AnalyticalDB 公共层与 common-mq Redis Streams 实现

- 建立 Redis 热态、MySQL 热数据、AnalyticalDB 历史查询与同步链路

- 收紧聊天记录幂等、摘要时序与持久化失败语义

easyflow-modules/easyflow-module-chatlog/src/main/java/tech/easyflow/chatlog/config/ChatCacheProperties.java

@@ -0,0 +1,48 @@
+package tech.easyflow.chatlog.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+import java.time.Duration;
+
+@Component
+@ConfigurationProperties(prefix = "easyflow.chat.cache")
+public class ChatCacheProperties {
+
+    private Duration sessionListTtl = Duration.ofMinutes(5);
+    private Duration sessionSummaryTtl = Duration.ofMinutes(10);
+    private Duration sessionTailTtl = Duration.ofMinutes(30);
+    private int tailSize = 50;
+
+    public Duration getSessionListTtl() {
+        return sessionListTtl;
+    }
+
+    public void setSessionListTtl(Duration sessionListTtl) {
+        this.sessionListTtl = sessionListTtl;
+    }
+
+    public Duration getSessionSummaryTtl() {
+        return sessionSummaryTtl;
+    }
+
+    public void setSessionSummaryTtl(Duration sessionSummaryTtl) {
+        this.sessionSummaryTtl = sessionSummaryTtl;
+    }
+
+    public Duration getSessionTailTtl() {
+        return sessionTailTtl;
+    }
+
+    public void setSessionTailTtl(Duration sessionTailTtl) {
+        this.sessionTailTtl = sessionTailTtl;
+    }
+
+    public int getTailSize() {
+        return tailSize;
+    }
+
+    public void setTailSize(int tailSize) {
+        this.tailSize = tailSize;
+    }
+}

easyflow-modules/easyflow-module-chatlog/src/main/java/tech/easyflow/chatlog/config/ChatSyncProperties.java

@@ -0,0 +1,55 @@
+package tech.easyflow.chatlog.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+@Component
+@ConfigurationProperties(prefix = "easyflow.chat.sync")
+public class ChatSyncProperties {
+
+    private boolean enabled = false;
+    private int batchSize = 500;
+    private long fixedDelay = 30000L;
+    private int repairLookbackDays = 3;
+    private int retentionMonths = 3;
+
+    public boolean isEnabled() {
+        return enabled;
+    }
+
+    public void setEnabled(boolean enabled) {
+        this.enabled = enabled;
+    }
+
+    public int getBatchSize() {
+        return batchSize;
+    }
+
+    public void setBatchSize(int batchSize) {
+        this.batchSize = batchSize;
+    }
+
+    public long getFixedDelay() {
+        return fixedDelay;
+    }
+
+    public void setFixedDelay(long fixedDelay) {
+        this.fixedDelay = fixedDelay;
+    }
+
+    public int getRepairLookbackDays() {
+        return repairLookbackDays;
+    }
+
+    public void setRepairLookbackDays(int repairLookbackDays) {
+        this.repairLookbackDays = repairLookbackDays;
+    }
+
+    public int getRetentionMonths() {
+        return retentionMonths;
+    }
+
+    public void setRetentionMonths(int retentionMonths) {
+        this.retentionMonths = retentionMonths;
+    }
+}

easyflow-modules/easyflow-module-chatlog/src/main/java/tech/easyflow/chatlog/config/ChatlogModuleConfig.java

@@ -0,0 +1,9 @@
+package tech.easyflow.chatlog.config;
+
+import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+
+@AutoConfiguration
+@MapperScan("tech.easyflow.chatlog.mapper")
+public class ChatlogModuleConfig {
+}