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/wire/repository.go

@@ -55,6 +55,9 @@ var RepositorySet = wire.NewSet(
 
 	// 版本日志同步
 	repository.NewConversationVersionLogRepository,
+
+	// 文件上传记录（聊天文件 TTL 过期清理）
+	repository.NewUploadedFileRepository,
 )
 
 // ProvideUserActivityRepository 提供用户活跃数据仓储