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/orchestrator/orchestrator_test.go

@@ -155,8 +155,9 @@ func (s *mockStore) SaveBrowsePage(_ context.Context, _, _ string) error { retur
 func (s *mockStore) GetBrowsePage(_ context.Context, _ string) (string, bool, error) {
 	return "", false, nil
 }
-func (s *mockStore) BrowseHTMLKey(_ string, _ int) string { return "" }
-func (s *mockStore) BrowseCoverKey(_, _ string) string    { return "" }
+func (s *mockStore) BrowseHTMLKey(_ string, _ int) string                         { return "" }
+func (s *mockStore) BrowseFilteredHTMLKey(_ string, _ int, _, _, _ string) string { return "" }
+func (s *mockStore) BrowseCoverKey(_, _ string) string                            { return "" }
 func (s *mockStore) SaveBrowseAsset(_ context.Context, _ string, _ []byte, _ string) error {
 	return nil
 }

scraper/internal/server/handlers_browse.go

@@ -80,7 +80,7 @@ func (s *Server) handleBrowse(w http.ResponseWriter, r *http.Request) {
 	defer cancel()
 
 	// ── Cache-first: try MinIO snapshot (new key layout) ─────────────────
-	cacheKey := s.store.BrowseHTMLKey(novelFireDomain, pageNum)
+	cacheKey := s.store.BrowseFilteredHTMLKey(novelFireDomain, pageNum, sortBy, genre, status)
 	if html, ok, err := s.store.GetBrowsePage(ctx, cacheKey); err == nil && ok && len(html) > 0 {
 		novels, hasNext := parseBrowsePage(strings.NewReader(html))
 		s.log.Debug("browse: served from cache", "key", cacheKey)

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)
 }

scraper/internal/storage/minio.go

@@ -223,10 +223,33 @@ func (m *MinioClient) PresignAudio(ctx context.Context, key string, expires time
 
 // BrowseHTMLKey returns the MinIO object key for a SingleFile HTML snapshot.
 // Layout: {domain}/html/page-{n}.html
+// This uses the default (popular/all/all) filter combination.
 func BrowseHTMLKey(domain string, page int) string {
 	return fmt.Sprintf("%s/html/page-%d.html", domain, page)
 }
 
+// BrowseFilteredHTMLKey returns the MinIO object key for a browse page snapshot
+// that includes filter parameters (sort, genre, status) in the key so that
+// different filter combinations are cached independently.
+// Layout: {domain}/html/{sort}-{genre}-{status}/page-{n}.html
+// Falls back to BrowseHTMLKey when all filters are at their default values
+// (sort=popular, genre=all, status=all) for cache compatibility.
+func BrowseFilteredHTMLKey(domain string, page int, sort, genre, status string) string {
+	if (sort == "" || sort == "popular") && (genre == "" || genre == "all") && (status == "" || status == "all") {
+		return BrowseHTMLKey(domain, page)
+	}
+	if sort == "" {
+		sort = "popular"
+	}
+	if genre == "" {
+		genre = "all"
+	}
+	if status == "" {
+		status = "all"
+	}
+	return fmt.Sprintf("%s/html/%s-%s-%s/page-%d.html", domain, sort, genre, status, page)
+}
+
 // BrowseCoverKey returns the MinIO object key for a cached book cover image.
 // Layout: {domain}/assets/book-covers/{slug}.jpg
 func BrowseCoverKey(domain, slug string) string {

scraper/internal/storage/store.go

@@ -156,6 +156,9 @@ type Store interface {
 	// BrowseHTMLKey returns the MinIO object key for a SingleFile HTML snapshot.
 	// Layout: {domain}/html/page-{n}.html
 	BrowseHTMLKey(domain string, page int) string
+	// BrowseFilteredHTMLKey returns the MinIO object key for a browse page snapshot
+	// that incorporates sort/genre/status so different filter combos are cached separately.
+	BrowseFilteredHTMLKey(domain string, page int, sort, genre, status string) string
 	// BrowseCoverKey returns the MinIO object key for a cached book cover image.
 	// Layout: {domain}/assets/book-covers/{slug}.jpg
 	BrowseCoverKey(domain, slug string) string