fix(archive&generation): 修复时区和员工ID解析问题

1. 统一将时间计算改为使用上海时区，避免UTC零点导致中国时区上午消息被遗漏
2. 新增用户ID数组解析逻辑，支持处理格式为JSON数组的员工ID字段
3. 过滤外部用户ID，避免将外部账号关联到客户联系人中

backend/archive-service/src/main/java/com/artedu/archive/service/ArchiveContactService.java

@@ -164,8 +164,13 @@ public class ArchiveContactService {
 
                 // 更新关联员工列表
                 String oppositeStaff = "INTERNAL".equals(message.getFromRole()) ? fromUser : message.getToUser();
-                if (oppositeStaff != null && !oppositeStaff.isEmpty() && !isExternalUserId(oppositeStaff)) {
+                if (oppositeStaff != null && !oppositeStaff.isEmpty()) {
-                    updateCustomerStaffIds(existing, oppositeStaff);
+                    // to_user 可能存的是 JSON 数组（如 ["LiRong"]），需解析后逐个提取真实员工ID
+                    for (String staffId : parsePossibleUserIds(oppositeStaff)) {
+                        if (!isExternalUserId(staffId)) {
+                            updateCustomerStaffIds(existing, staffId);
+                        }
+                    }
                 }
 
                 customerMapper.updateById(existing);
@@ -328,6 +333,29 @@ public class ArchiveContactService {
         return userId != null && (userId.startsWith("wm") || userId.startsWith("wo"));
     }
 
+    /**
+     * 解析可能为 JSON 数组的用户ID字段（如 ["DengHan"]），返回逐个ID列表
+     */
+    private List<String> parsePossibleUserIds(String fieldValue) {
+        if (fieldValue.startsWith("[") && fieldValue.endsWith("]")) {
+            try {
+                List<String> ids = JsonUtils.fromJsonList(fieldValue, String.class);
+                if (ids != null) {
+                    return ids.stream()
+                            .filter(Objects::nonNull)
+                            .map(String::trim)
+                            .filter(s -> !s.isEmpty())
+                            .collect(Collectors.toList());
+                }
+            } catch (Exception e) {
+                log.debug("解析userId JSON数组失败: {}", fieldValue);
+            }
+            // 回退：去掉括号引号后按单值处理
+            return Collections.singletonList(fieldValue.replaceAll("[\\[\\]\"]", "").trim());
+        }
+        return Collections.singletonList(fieldValue);
+    }
+
     /**
      * 全量扫描历史消息，补全 staff/customer 记录
      */
@@ -539,14 +567,19 @@ public class ArchiveContactService {
                         try {
                             List<String> parsed = JsonUtils.fromJsonList(rawId, String.class);
                             if (parsed != null) {
-                                staffIdSet.addAll(parsed.stream().filter(s -> s != null && !s.isEmpty()).collect(Collectors.toList()));
+                                staffIdSet.addAll(parsed.stream()
+                                        .filter(s -> s != null && !s.isEmpty() && !isExternalUserId(s))
+                                        .collect(Collectors.toList()));
                                 continue;
                             }
                         } catch (Exception e) {
                             log.debug("解析员工ID JSON 数组失败: {}", rawId);
                         }
-                        staffIdSet.add(rawId.replaceAll("[\\[\\]\"]", "").trim());
+                        String fallback = rawId.replaceAll("[\\[\\]\"]", "").trim();
-                    } else {
+                        if (!fallback.isEmpty() && !isExternalUserId(fallback)) {
+                            staffIdSet.add(fallback);
+                        }
+                    } else if (!isExternalUserId(rawId)) {
                         staffIdSet.add(rawId);
                     }
                 }

backend/generation-service/src/main/java/com/artedu/generation/controller/GenerationController.java

@@ -38,6 +38,8 @@ import java.util.stream.Collectors;
 @RequestMapping("/api/v1/generation")
 public class GenerationController {
 
+    private static final ZoneId SHANGHAI_ZONE = ZoneId.of("Asia/Shanghai");
+
     @Autowired
     private QianwenClient qianwenClient;
 
@@ -216,7 +218,7 @@ public class GenerationController {
         List<ArchiveMessage> messages;
         boolean isGroupChat = roomid != null && !roomid.isEmpty();
 
-        // 查最近 今 天，避免今天没聊天就找不到记录
+        // 查今天（按上海时区），避免 UTC 零点导致中国时区上午消息被漏掉
         long startTime = getTodayStartTime();
         long endTime = getTodayEndTime();
 //// 指定日期：2026-05-22  todo 测试需要
@@ -259,15 +261,15 @@ public class GenerationController {
     }
 
     private long getTodayStartTime() {
-        return java.time.LocalDate.now().atStartOfDay(java.time.ZoneId.systemDefault()).toInstant().toEpochMilli();
+        return java.time.LocalDate.now().atStartOfDay(SHANGHAI_ZONE).toInstant().toEpochMilli();
     }
 
     private long getTodayEndTime() {
-        return java.time.LocalDate.now().plusDays(1).atStartOfDay(java.time.ZoneId.systemDefault()).toInstant().toEpochMilli() - 1;
+        return java.time.LocalDate.now().plusDays(1).atStartOfDay(SHANGHAI_ZONE).toInstant().toEpochMilli() - 1;
     }
 
     private long get7DaysAgoStartTime() {
-        return java.time.LocalDate.now().minusDays(7).atStartOfDay(java.time.ZoneId.systemDefault()).toInstant().toEpochMilli();
+        return java.time.LocalDate.now().minusDays(7).atStartOfDay(SHANGHAI_ZONE).toInstant().toEpochMilli();
     }
 
     /**