perf(scraper): use direct HTTP for chapter text fetching, bypass Browserless

novelfire.net chapter content is server-rendered, so Browserless is not
needed. Add a dedicated chapterClient (always StrategyDirect) to Scraper
and use it in ScrapeChapterText, removing the now-irrelevant WaitFor /
RejectResourceTypes / GotoOptions fields from the ContentRequest.

scraper/internal/e2e/e2e_test.go

@@ -121,7 +121,7 @@ func newE2EFixture(t *testing.T) *e2eFixture {
 		MaxConcurrent: 2,
 	})
 	log := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelWarn}))
-	sc := novelfire.New(directClient, log, urlClient, nil)
+	sc := novelfire.New(directClient, log, urlClient, directClient, nil)
 
 	return &e2eFixture{
 		sc:         sc,