feat(latest): parse newest chapter for novelfull and lightnovelworld

backend/internal/latest/sites.go

@@ -1,6 +1,7 @@
 package latest
 
 import (
+	"net/url"
 	"regexp"
 	"strconv"
 	"strings"
@@ -34,6 +35,17 @@ var comixSlugRe = regexp.MustCompile(`/title/([^/?#]+)`)
 // there are no anchors to scan.
 var kaganeChapterRe = regexp.MustCompile(`"chapter_no":"([0-9.]+)"`)
 
+// novelfullSlugRe pulls the series slug out of a stored series_url. novelfull
+// series pages are "/<slug>.html"; their chapter anchors are
+// "/<slug>/chapter-<n>[-<title-slug>].html". Verified live 2026-08-05.
+var novelfullSlugRe = regexp.MustCompile(`^/([^/?#]+)\.html$`)
+
+// lnwSlugRe does the same for lightnovelworld, whose series pages live under
+// /novel/<slug>/ while its chapter URLs are flat at the site root:
+// "/<slug>-chapter-<n>/", absolute in the page's own anchors. Verified live
+// 2026-08-05.
+var lnwSlugRe = regexp.MustCompile(`^/novel/([^/?#]+)/?$`)
+
 // latestChapterFrom returns the highest chapter number body advertises for this
 // series. ok is false when the body yields nothing usable — an unknown site, an
 // empty body, a Cloudflare challenge page, and a site redesign all land here,
@@ -86,6 +98,29 @@ func latestChapterFrom(site, seriesURL, body string) (latestChapter, bool) {
 		re = regexp.MustCompile(`"latestChapterUrl":"/title/` + regexp.QuoteMeta(id) + `-[^"]*-chapter-([0-9.]+)"`)
 	case "kagane":
 		re = kaganeChapterRe
+	case "novelfull":
+		u, err := url.Parse(seriesURL)
+		if err != nil {
+			return latestChapter{}, false
+		}
+		m := novelfullSlugRe.FindStringSubmatch(u.Path)
+		if m == nil {
+			return latestChapter{}, false
+		}
+		// Scoped to this series' slug for the same reason asura is: page 1
+		// carries a "latest chapters" widget and a "you may also like" strip,
+		// and neither may contribute to the maximum.
+		re = regexp.MustCompile(`/` + regexp.QuoteMeta(m[1]) + `/chapter-([0-9.]+)`)
+	case "lightnovelworld":
+		u, err := url.Parse(seriesURL)
+		if err != nil {
+			return latestChapter{}, false
+		}
+		m := lnwSlugRe.FindStringSubmatch(u.Path)
+		if m == nil {
+			return latestChapter{}, false
+		}
+		re = regexp.MustCompile(`lightnovelworld\.net/` + regexp.QuoteMeta(m[1]) + `-chapter-([0-9.]+)/`)
 	default:
 		return latestChapter{}, false
 	}