feat(server): implement chat file TTL cleanup and enhance JPush vendor channel support

Add FileCleanupWorker for automatic expiration of chat files with configurable retention period and batch processing. Files uploaded via `/api/v1/uploads/files` are tracked in `uploaded_files` table with expiration timestamps, then deleted from S3 and database upon expiry. Expired file URLs are injected as `"expired": true` in message responses.

Extend JPush push notification configuration with vendor-specific channel_id support (xiaomi, huawei, oppo, vivo, meizu, honor, fcm) for differentiating system vs chat notifications. Add iOS APNs thread-id grouping configuration for notification categorization.

internal/dto/message_converter.go

@@ -8,6 +8,13 @@ import (
 
 // ConvertMessageToResponse 将Message转换为MessageResponse
 func ConvertMessageToResponse(message *model.Message) *MessageResponse {
+	return ConvertMessageToResponseWithExpiry(message, nil)
+}
+
+// ConvertMessageToResponseWithExpiry 将Message转换为MessageResponse，并对已过期的 file segment 注入 expired 标记。
+// expiredURLSet 为已从 S3 清理的文件 URL 集合（可为 nil，表示不标记）。
+// 注意：注入时对 file segment 的 Data 做深拷贝，避免污染消息缓存。
+func ConvertMessageToResponseWithExpiry(message *model.Message, expiredURLSet map[string]struct{}) *MessageResponse {
 	if message == nil {
 		return nil
 	}
@@ -15,6 +22,19 @@ func ConvertMessageToResponse(message *model.Message) *MessageResponse {
 	// 直接使用 segments，不需要解析
 	segments := make(model.MessageSegments, len(message.Segments))
 	for i, seg := range message.Segments {
+		// 对 file 类型且 URL 已过期的 segment，深拷贝 Data 并注入 expired 标记
+		if seg.Type == string(model.ContentTypeFile) && len(expiredURLSet) > 0 {
+			url, _ := seg.Data["url"].(string)
+			if _, expired := expiredURLSet[url]; expired {
+				newData := make(map[string]any, len(seg.Data)+1)
+				for k, v := range seg.Data {
+					newData[k] = v
+				}
+				newData["expired"] = true
+				segments[i] = model.MessageSegment{Type: seg.Type, Data: newData}
+				continue
+			}
+		}
 		segments[i] = model.MessageSegment{
 			Type: seg.Type,
 			Data: seg.Data,
@@ -107,6 +127,15 @@ func ConvertMessagesToResponse(messages []*model.Message) []*MessageResponse {
 	return result
 }
 
+// ConvertMessagesToResponseWithExpiry 将Message列表转换为响应列表，并标记过期文件
+func ConvertMessagesToResponseWithExpiry(messages []*model.Message, expiredURLSet map[string]struct{}) []*MessageResponse {
+	result := make([]*MessageResponse, 0, len(messages))
+	for _, msg := range messages {
+		result = append(result, ConvertMessageToResponseWithExpiry(msg, expiredURLSet))
+	}
+	return result
+}
+
 
 // ==================== PushRecord 转换 ====================