fix(tests): URL-encode series name in special characters test

The TestGetSeries_SpecialCharactersInName test was failing with a 400
status because the series name 'Series: Book & Other (Vol. 1)' was
interpolated directly into the URL without encoding. The ampersand was
parsed as a query parameter delimiter, corrupting the request.

Use url.QueryEscape() to properly encode the name parameter.

cmd/server/tests/series_integration_test.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/url"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -254,7 +255,7 @@ func (s *SeriesIntegrationTestSuite) TestGetSeriesBooks_Unauthorized() {
 
 func (s *SeriesIntegrationTestSuite) TestGetSeries_SpecialCharactersInName() {
 	seriesName := "Series: Book & Other (Vol. 1)"
-	url := fmt.Sprintf("%s/api/series/books?library_id=%s&name=%s", s.setup.Server.URL, s.libraryID, seriesName)
+	url := fmt.Sprintf("%s/api/series/books?library_id=%s&name=%s", s.setup.Server.URL, s.libraryID, url.QueryEscape(seriesName))
 	req, _ := http.NewRequest("GET", url, nil)
 	req.Header.Set("Authorization", "Bearer "+s.token)