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>

userscript/CLAUDE.md

@@ -3,10 +3,10 @@ Guidance for Claude Code working under `userscript/`. See root `CLAUDE.md` for t
 ### Userscript structure (single IIFE, `manga-bookmark.user.js`)
 
 1. **Site adapters** — one per host, `detect(location, document)` return page `type` + IDs. Identify type/IDs from **URL regex** (most stable); pull `title`/`cover` from **`og:title`/`og:image` meta tags**, not CSS classes.
-2. **API client** — `apiGet/apiPut/apiDelete` with bearer header; `localStorage` key `mangabm:cache` for instant render + offline fallback.
+2. **API client** — `apiGet/apiPut/apiDelete` with bearer header; `localStorage` key `bmgr:manga:cache` for instant render + offline fallback.
 3. **Progress logic** — auto-upsert `last_chapter` only when `chapterNum >= stored last_chapter_num` (re-reading old chapters must not regress progress; unparseable -> set current). Manual panel override forces any value.
 4. **Retry queue** — every write go through `pushBookmark`/`pushDelete`, so
-   failed mutation park in `localStorage` (`mangabm:queue`) and replayed on
+   failed mutation park in `localStorage` (`bmgr:manga:queue`) and replayed on
    next navigation, reconnect, or `refresh()`. Entries are markers
    (`{key, op, sendStatus, attempts}`), never payloads — body read from
    cache at send time, so one entry per key give ordering and coalescing for
@@ -44,3 +44,21 @@ Guidance for Claude Code working under `userscript/`. See root `CLAUDE.md` for t
   Encodings (incl. triple-encoded punctuation like `%25252D`) identical
   on /manga/ and /title/ pages, so decode-once seriesIds match — verified
   2026-07-28.
+- **novelfull.com** (novel script): series `/<slug>.html`, chapter
+  `/<slug>/chapter-<n>[-<title-slug>].html`. No `og:*` tags at all — title from
+  `h3.title` (series) or `a.truyen-title` (chapter), cover from
+  `meta[name="image"]`. Behind a Cloudflare JS challenge no TLS fingerprint
+  clears, so the backend polls it through the headless browser.
+- **lightnovelworld.net** (novel script): series `/novel/<slug>/`, chapter
+  `/<slug>-chapter-<n>/` — flat, at the site root. `h1.entry-title` is the clean
+  title on a series page and `<Title> Chapter <n>` on a chapter page. Chapter
+  pages carry no `og:image`. Its series page lists every chapter with an
+  absolute href, so the backend polls it with the plain TLS client.
+
+### Second script: `novel-bookmark.user.js`
+
+A copy of the manga script with two adapters, `LIBRARY = "novel"` and
+`STORE_PREFIX = "bmgr:novel:"`. No migration loop (this script has no previous
+installation to carry keys over from). Installed alongside the manga script;
+both write to the same backend with the same `LIBRARY` column discriminating
+them.