rebrand: MangaBM → BookmarkManager, add novel library support (#15)

Two intertwined changes — the rebrand and the novel library were developed on
the same branch because the novel UI plumbing is part of the new "Bookmark
Manager" wordmark in the web shell.

## What it does

- **Rebrand**: MangaBM → BookmarkManager across the Go module, compose stack,
  env vars, Traefik hostnames, container/image names, userscript storage
  prefixes (`mangabm:cache` → `bmgr:manga:cache`, `mangabm:queue` → `bmgr:manga:queue`),
  and docs.
- **Novel library**: same backend, two libraries. New `kind` column splits
  bookmarks into `manga` / `novel`; PUT validates it. Two userscripts:
  - `manga-bookmark.user.js` — unchanged behaviour, just stamps its own `kind`.
  - `novel-bookmark.user.js` — separate Violentmonkey install with adapters
    for **novelfull.com** (polled via headless browser — Cloudflare JS
    challenge) and **lightnovelworld.net** (polled via plain TLS).
- **Web UI**: library switch on the app shell. Login art, libswitch, and
  novel-site colours from the Cinder design snapshot.

## Plumbing

- `addedColumns` ALTER for `kind` runs on first start after upgrade; every
  pre-existing row is backfilled to `'manga'`. No manual SQL, no down-time.
- `ALLOWED_ORIGINS` gains the two novel sites.
- New `NOVEL_USERSCRIPT_PATH` env (default `/userscript/novel-bookmark.user.js`),
  bindmounted alongside the manga script.
- Traefik router names `mangabm*` → `bmapi*` / `bmweb*`.

## Test status

- `go test ./...` — green
- `node --test userscript/test/logic.test.js` — 34 pass
- `node --test userscript/test/novel-logic.test.js` — 11 pass
- `node --check` on both userscripts — clean

## Notes for the redeploy

.env keys were renamed (`MANGA_API_HOST` → `BOOKMARK_API_HOST`,
`MANGA_WEB_HOST` → `BOOKMARK_WEB_HOST`). Update DNS / Traefik labels on the
prod override before pulling, otherwise the public hostnames go dark.
See the redeploy instructions I'll post next to this PR.

Reviewed-on: #15
Co-authored-by: Sulthan Zaki <sultankiki05@gmail.com>
Co-committed-by: Sulthan Zaki <sultankiki05@gmail.com>

backend/internal/latest/sites.go

@@ -1,11 +1,12 @@
 package latest
 
 import (
+	"net/url"
 	"regexp"
 	"strconv"
 	"strings"
 
-	"mangabm/backend/internal/store"
+	"bookmarkmanager/backend/internal/store"
 )
 
 // latestChapter is the newest chapter a series page advertises.
@@ -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
 	}