fix: 金蝶附件上传补齐合规附件文件后缀名

合规报文无文件名字段，固定名付款特批附件无后缀被BFI拒收（无后缀名不支持上传）；改为解析C103-5响应头Content-Disposition文件名，其次按Content-Type映射扩展名，兜底.pdf；主单已同步时重推同步金蝶自动重试附件上传

blade-service/blade-transport/src/main/java/org/springblade/transport/support/KingdeeAttachmentSyncSupport.java

@@ -44,9 +44,11 @@ import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URI;
+import java.net.URLDecoder;
 import java.net.http.HttpClient;
 import java.net.http.HttpRequest;
 import java.net.http.HttpResponse;
+import java.nio.charset.StandardCharsets;
 import java.time.Duration;
 import java.time.LocalDateTime;
 import java.util.ArrayList;
@@ -177,12 +179,14 @@ public class KingdeeAttachmentSyncSupport {
 					throw new IllegalArgumentException("附件超过20MB大小限制（"
 						+ formatSize(item.size()) + "），请压缩后重试");
 				}
-				byte[] content = fetchContent(item);
+				FetchedFile fetched = fetchContent(item);
+				byte[] content = fetched.content();
 				if (content.length > KingdeeAttachmentConstant.MAX_FILE_SIZE_BYTES) {
 					throw new IllegalArgumentException("附件超过20MB大小限制（"
 						+ formatSize((long) content.length) + "），请压缩后重试");
 				}
-				String fileName = Func.isBlank(item.name()) ? "attachment" : item.name();
+				String fileName = Func.isNotBlank(fetched.fileName()) ? fetched.fileName()
+					: (Func.isBlank(item.name()) ? "attachment" : item.name());
 				BfiAttachmentUploadVO uploadVO = bfiService.uploadAttachment(entityNumber, billPkId,
 					KingdeeAttachmentConstant.CONTROL_KEY, fileName, content);
 				log.info("金蝶附件上传成功：业务单据[{}:{}]，附件[{}]，kingdeePath={}", bizType, bizId, item.name(), uploadVO.getPath());
@@ -384,15 +388,24 @@ public class KingdeeAttachmentSyncSupport {
 		return record;
 	}
 
+	/**
+	 * 附件内容拉取结果（合规附件按 C103-5 响应头解析真实文件名，其余来源 fileName 为 null 沿用原名称）
+	 *
+	 * @param content  附件内容
+	 * @param fileName 解析出的文件名（可空）
+	 */
+	private record FetchedFile(byte[] content, String fileName) {
+	}
+
 	/**
 	 * 拉取附件内容：合规附件经 C103-5 按合规附件ID 下载（流式读取，防大文件全量进内存失控）；
 	 * 星瀚侧文件经 A801-2 下载（流式读取）；用户附件按 http(s) url 下载（流式读取）。调用方负责按 20MB 上限校验
 	 */
-	private byte[] fetchContent(KingdeeAttachmentItem item) throws Exception {
+	private FetchedFile fetchContent(KingdeeAttachmentItem item) throws Exception {
 		if (item.hcsFdIdSource()) {
 			Response response = hcsAttachmentSupport.downloadRaw(item.key());
 			try (InputStream inputStream = response.body().asInputStream()) {
-				return readCapped(inputStream);
+				return new FetchedFile(readCapped(inputStream), resolveHcsFileName(response, item.name()));
 			} finally {
 				response.close();
 			}
@@ -400,7 +413,7 @@ public class KingdeeAttachmentSyncSupport {
 		if (item.kingdeePathSource()) {
 			Response response = bfiService.downloadInvoice(item.key());
 			try (InputStream inputStream = response.body().asInputStream()) {
-				return readCapped(inputStream);
+				return new FetchedFile(readCapped(inputStream), null);
 			} finally {
 				response.close();
 			}
@@ -414,10 +427,88 @@ public class KingdeeAttachmentSyncSupport {
 			throw new IllegalStateException("附件下载失败，HTTP状态码 " + response.statusCode());
 		}
 		try (InputStream inputStream = response.body()) {
-			return readCapped(inputStream);
+			return new FetchedFile(readCapped(inputStream), null);
 		}
 	}
 
+	/**
+	 * 解析合规附件文件名（BFI 附件上传要求带后缀名）：名称已带后缀原样返回；
+	 * 否则优先取 C103-5 响应头 Content-Disposition 文件名，其次按 Content-Type 映射扩展名追加，兜底 .pdf
+	 *
+	 * @param response     C103-5 文件流响应
+	 * @param fallbackName 兜底名称（无扩展名）
+	 * @return 带后缀名的文件名
+	 */
+	private String resolveHcsFileName(Response response, String fallbackName) {
+		String name = Func.isBlank(fallbackName) ? "付款特批附件" : fallbackName.trim();
+		if (name.lastIndexOf('.') > 0) {
+			return name;
+		}
+		String fromDisposition = fileNameFromDisposition(firstHeader(response, "Content-Disposition"));
+		if (Func.isNotBlank(fromDisposition) && fromDisposition.lastIndexOf('.') > 0) {
+			return fromDisposition;
+		}
+		return name + extensionOfContentType(firstHeader(response, "Content-Type"));
+	}
+
+	/**
+	 * 响应头 Content-Disposition 文件名提取（容忍 filename*=UTF-8''xxx 与 filename="xxx" 两种形式，异常返回 null）
+	 */
+	private String fileNameFromDisposition(String disposition) {
+		if (Func.isBlank(disposition)) {
+			return null;
+		}
+		try {
+			String lower = disposition.toLowerCase();
+			int index = lower.indexOf("filename*=");
+			if (index >= 0) {
+				String value = disposition.substring(index + "filename*=".length());
+				int quote = value.indexOf("''");
+				value = quote >= 0 ? value.substring(quote + 2) : value;
+				return URLDecoder.decode(value.replaceAll("\"", "").trim(), StandardCharsets.UTF_8);
+			}
+			index = lower.indexOf("filename=");
+			if (index >= 0) {
+				return URLDecoder.decode(disposition.substring(index + "filename=".length())
+					.replaceAll("\"", "").trim(), StandardCharsets.UTF_8);
+			}
+		} catch (Exception ignored) {
+			// 响应头格式异常按无文件名处理，走 Content-Type 扩展名兜底
+		}
+		return null;
+	}
+
+	/** 响应头取值（key 忽略大小写，取首个非空值） */
+	private String firstHeader(Response response, String name) {
+		if (response.headers() == null) {
+			return null;
+		}
+		for (Map.Entry<String, Collection<String>> header : response.headers().entrySet()) {
+			if (header.getKey() != null && header.getKey().equalsIgnoreCase(name) && Func.isNotEmpty(header.getValue())) {
+				for (String value : header.getValue()) {
+					if (Func.isNotBlank(value)) {
+						return value;
+					}
+				}
+			}
+		}
+		return null;
+	}
+
+	/** Content-Type → 扩展名（特批结果附件常规为 pdf，未识别类型兜底 .pdf） */
+	private String extensionOfContentType(String contentType) {
+		String type = contentType == null ? "" : contentType.split(";")[0].trim().toLowerCase();
+		return switch (type) {
+			case "application/pdf" -> ".pdf";
+			case "image/jpeg" -> ".jpg";
+			case "image/png" -> ".png";
+			case "image/bmp" -> ".bmp";
+			case "image/gif" -> ".gif";
+			case "application/ofd" -> ".ofd";
+			default -> ".pdf";
+		};
+	}
+
 	/** 流式读取并封顶（超出软限制即中断读取，避免大文件占满内存） */
 	private byte[] readCapped(InputStream inputStream) throws IOException {
 		int bufferSize = 64 * 1024;