Добавил реализацию

internal/qbt/qbt.go

@@ -73,6 +73,7 @@ type AddRequest struct {
 	Torrents [][]byte // .torrent-файлы (Ф1 не использует)
 	Category string
 	SavePath string
+	Rename   string // отображаемое имя торрента (param rename); пустое — не задаём
 	Paused   bool
 }
 
@@ -173,6 +174,9 @@ func (c *Client) Add(ctx context.Context, ar AddRequest) error {
 	if ar.SavePath != "" {
 		_ = mw.WriteField("savepath", ar.SavePath)
 	}
+	if ar.Rename != "" {
+		_ = mw.WriteField("rename", ar.Rename)
+	}
 	_ = mw.WriteField("paused", strconv.FormatBool(ar.Paused))
 	for i, data := range ar.Torrents {
 		fw, err := mw.CreateFormFile("torrents", fmt.Sprintf("file%d.torrent", i))

internal/qbt/qbt_test.go

@@ -69,6 +69,51 @@ func newClient(t *testing.T, url string) *Client {
 	return c
 }
 
+func TestAddSendsRename(t *testing.T) {
+	tests := []struct {
+		name       string
+		rename     string
+		wantField  string
+		wantHasKey bool
+	}{
+		{name: "with rename", rename: "Дюна: Часть вторая (2024)", wantField: "Дюна: Часть вторая (2024)", wantHasKey: true},
+		{name: "empty rename omits field", rename: "", wantHasKey: false},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			var gotField string
+			var hasKey bool
+			mux := http.NewServeMux()
+			mux.HandleFunc("/api/v2/torrents/add", func(w http.ResponseWriter, r *http.Request) {
+				if err := r.ParseMultipartForm(1 << 20); err != nil {
+					http.Error(w, err.Error(), http.StatusBadRequest)
+					return
+				}
+				_, hasKey = r.MultipartForm.Value["rename"]
+				gotField = r.FormValue("rename")
+				_, _ = w.Write([]byte("Ok."))
+			})
+			srv := httptest.NewServer(mux)
+			t.Cleanup(srv.Close)
+
+			c := newClient(t, srv.URL)
+			err := c.Add(context.Background(), AddRequest{
+				URLs:   []string{"magnet:?xt=urn:btih:541adcff3b6dd5dba7088ea83317d9d6fac331d6"},
+				Rename: tc.rename,
+			})
+			if err != nil {
+				t.Fatalf("Add: %v", err)
+			}
+			if hasKey != tc.wantHasKey {
+				t.Errorf("наличие поля rename = %v, want %v", hasKey, tc.wantHasKey)
+			}
+			if gotField != tc.wantField {
+				t.Errorf("rename = %q, want %q", gotField, tc.wantField)
+			}
+		})
+	}
+}
+
 func TestAddPerformsLazyLogin(t *testing.T) {
 	srv := fakeQBittorrent(t, "[]")
 	c := newClient(t, srv.URL)