Fix browse filters having no effect due to filter-agnostic cache key

The MinIO cache key only encoded page number, so all filter combinations
hit the same cache entry and returned unfiltered results. Introduce
BrowseFilteredHTMLKey() that encodes sort/genre/status into the key
(e.g. novelfire.net/html/new-isekai-completed/page-1.html); falls back
to the original page-only key for default filters to preserve existing
cached pages.

scraper/internal/storage/hybrid.go

@@ -330,6 +330,10 @@ func (h *HybridStore) BrowseHTMLKey(domain string, page int) string {
 	return BrowseHTMLKey(domain, page)
 }
 
+func (h *HybridStore) BrowseFilteredHTMLKey(domain string, page int, sort, genre, status string) string {
+	return BrowseFilteredHTMLKey(domain, page, sort, genre, status)
+}
+
 func (h *HybridStore) BrowseCoverKey(domain, slug string) string {
 	return BrowseCoverKey(domain, slug)
 }