fix: preserve QQ attachment filenames for local uploads

pkg/channels/qq/qq.go

@@ -354,7 +354,7 @@ func (c *QQChannel) SendMedia(ctx context.Context, msg bus.OutboundMediaMessage)
 			return fmt.Errorf("qq send media: resolve local media ref %q: %w", part.Ref, err)
 		}
 
-		fileInfo, err := c.uploadLocalMedia(ctx, chatKind, msg.ChatID, part.Type, resolved)
+		fileInfo, err := c.uploadLocalMedia(ctx, chatKind, msg.ChatID, part.Type, part.Filename, resolved)
 		if err != nil {
 			logger.ErrorCF("qq", "Failed to upload local media", map[string]any{
 				"type":     part.Type,

pkg/channels/qq/qq_test.go

@@ -166,6 +166,9 @@ func TestSendMedia_LocalFileUploadsThenSendsRichMediaMessage(t *testing.T) {
 	if fileData == "" {
 		t.Fatal("file_data is empty, want base64-encoded local file contents")
 	}
+	if payload["file_name"] != "report.pdf" {
+		t.Fatalf("file_name = %v, want %q", payload["file_name"], "report.pdf")
+	}
 
 	if len(api.groupMessages) != 1 {
 		t.Fatalf("group message count = %d, want 1", len(api.groupMessages))

pkg/channels/qq/upload.go

@@ -7,6 +7,8 @@ import (
 	"fmt"
 	"net/http"
 	"os"
+	"path/filepath"
+	"strings"
 
 	"github.com/tencent-connect/botgo/constant"
 	"github.com/tencent-connect/botgo/dto"
@@ -33,6 +35,7 @@ func (c *QQChannel) uploadLocalMedia(
 	chatKind string,
 	chatID string,
 	partType string,
+	filename string,
 	localPath string,
 ) ([]byte, error) {
 	content, err := os.ReadFile(localPath)
@@ -40,8 +43,16 @@ func (c *QQChannel) uploadLocalMedia(
 		return nil, fmt.Errorf("read local media: %w", err)
 	}
 
+	filename = strings.TrimSpace(filename)
+	if filename == "" {
+		filename = filepath.Base(localPath)
+	} else {
+		filename = filepath.Base(filename)
+	}
+
 	payload := map[string]any{
 		"file_type":    qqFileType(partType),
+		"file_name":    filename,
 		"srv_send_msg": false,
 		"file_data":    base64.StdEncoding.EncodeToString(content),
 	}