Reescalado HD, ficha reorganizada y mejoras del lector

- Reescalado HD con Real-ESRGAN (ncnn-vulkan, GPU por /dev/dri): cola persistente,
  todo lo pendiente, un rango o capítulos elegidos en la lista, con estimación de tiempo.
  La versión HD va a <carpeta>/.hd/ sin tocar el original; marca HD en la lista de
  capítulos y casilla "Versión HD" en el lector.
- Imagen Debian slim (glibc + Mesa Vulkan + cwebp); compose con /dev/dri y RENDER_GID.
- Ficha: acciones principales + menú ⋯, panel "Biblioteca local" (copia local y HD),
  idioma junto a la lista de capítulos.
- Lector: la barra de progreso avanza de derecha a izquierda en der → izq; botón rápido
  páginas ⇄ vertical; en vertical "Ajustar alto" y "Separar páginas" para mangas.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/server.js

@@ -7,6 +7,7 @@ import crypto from 'node:crypto'
 import { DatabaseSync } from 'node:sqlite'
 import { writeCbz, readCbzIndex, sendCbzEntry, imageType } from './cbz.js'
 import { setupFeatures } from './features.js'
+import { setupUpscale } from './upscale.js'
 
 const PORT = Number(process.env.PORT || 3352)
 const DATA_DIR = process.env.DATA_DIR || '/app/data'
@@ -487,6 +488,7 @@ async function downloadChapter(dl, manga, c, dir) {
   }
   db.prepare(`INSERT OR REPLACE INTO downloaded_chapters (chapter_id, manga_id, num, title, file, pages, created_at) VALUES (?, ?, ?, ?, ?, ?, ?)`)
     .run(c.id, dl.manga_id, c.num ?? null, c.title || '', file, urls.length, Date.now())
+  upscale.onChapterDownloaded(dl.manga_id, c.id)
 }
 
 const dlUpdate = (mangaId, fields) => {
@@ -504,13 +506,16 @@ function mangaDirOf(folder) {
 }
 function dirSize(dir) {
   let total = 0
-  try { for (const f of fs.readdirSync(dir)) total += fs.statSync(path.join(dir, f)).size } catch {}
+  try {
+    for (const f of fs.readdirSync(dir, { withFileTypes: true })) total += f.isDirectory() ? dirSize(path.join(dir, f.name)) : fs.statSync(path.join(dir, f.name)).size
+  } catch {}
   return total
 }
 function deleteDownload(mangaId) {
   const dl = db.prepare('SELECT folder FROM downloads WHERE manga_id = ?').get(mangaId)
   if (!dl) return false
   const dir = mangaDirOf(dl.folder)
+  upscale.cancel(mangaId)
   db.prepare('DELETE FROM downloads WHERE manga_id = ?').run(mangaId) // borra también downloaded_chapters (CASCADE)
   dlCurrent.delete(mangaId)
   fs.rmSync(dir, { recursive: true, force: true })
@@ -589,10 +594,11 @@ function enqueueDownload(mangaId, title, lang) {
 }
 
 const cbzIndexCache = new Map()
-function localChapter(chapterId) {
-  const row = db.prepare(`SELECT c.file, d.folder FROM downloaded_chapters c JOIN downloads d ON d.manga_id = c.manga_id WHERE c.chapter_id = ?`).get(chapterId)
+// hd: usar la versión reescalada si existe.
+function localChapter(chapterId, hd = false) {
+  const row = db.prepare(`SELECT c.file, c.hd_file, d.folder FROM downloaded_chapters c JOIN downloads d ON d.manga_id = c.manga_id WHERE c.chapter_id = ?`).get(chapterId)
   if (!row) return null
-  const file = path.join(MANGA_DIR, row.folder, row.file)
+  const file = (hd && upscale.hdFileOf(chapterId)) || path.join(MANGA_DIR, row.folder, row.file)
   let st
   try { st = fs.statSync(file) } catch { return null }
   const key = `${file}:${st.mtimeMs}`
@@ -697,6 +703,7 @@ async function route(req, res) {
   // Todo lo demás requiere sesión.
   const user = requireUser(req)
   if ((await features.route(p, method, q, req, res, user)) !== false) return
+  if ((await upscale.route(p, method, req, res)) !== false) return
 
   if (p === '/api/settings' && method === 'POST') {
     const body = await readBody(req)
@@ -748,18 +755,20 @@ async function route(req, res) {
     const reads = db.prepare('SELECT chapter_id, page, total_pages FROM chapter_reads WHERE user_id = ? AND manga_id = ?').all(user.id, m[1])
     const progress = db.prepare('SELECT * FROM progress WHERE user_id = ? AND manga_id = ?').get(user.id, m[1]) ?? null
     const chapterLangs = chapters.length || manga.source === 'lc' || offline ? [] : await getChapterLangs(m[1]).catch(() => [])
-    return json(res, 200, { manga, chapters, lang, reads, progress, chapterLangs, offline, downloaded, download: downloadInfo(m[1], true), ...features.mangaExtras(user.id, manga) })
+    return json(res, 200, { manga, chapters, lang, reads, progress, chapterLangs, offline, downloaded, download: downloadInfo(m[1], true), upscale: upscale.info(m[1]), ...features.mangaExtras(user.id, manga) })
   }
   if ((m = /^\/api\/chapter\/([^/]+)$/.exec(p)) && CHAPTER_ID.test(m[1]) && method === 'GET') {
-    const local = localChapter(m[1])
+    const hdAvailable = !!upscale.hdFileOf(m[1])
+    const hd = hdAvailable && q.get('hd') !== '0'
+    const local = localChapter(m[1], hd)
     const pages = local
-      ? local.entries.map((_, i) => `/api/local/${m[1]}/${i}`)
+      ? local.entries.map((_, i) => `/api/local/${m[1]}/${i}${hd ? '?hd=1' : ''}`)
       : m[1].startsWith('lc~') ? await lcPages(m[1]) : await getPages(m[1], q.get('saver') === '1')
     const read = db.prepare('SELECT page FROM chapter_reads WHERE user_id = ? AND chapter_id = ?').get(user.id, m[1])
-    return json(res, 200, { pages, savedPage: read?.page ?? 0, local: !!local })
+    return json(res, 200, { pages, savedPage: read?.page ?? 0, local: !!local, hd, hdAvailable })
   }
   if ((m = /^\/api\/local\/([^/]+)\/(\d+)$/.exec(p)) && CHAPTER_ID.test(m[1]) && method === 'GET') {
-    const local = localChapter(m[1])
+    const local = localChapter(m[1], q.get('hd') === '1')
     const entry = local?.entries[Number(m[2])]
     if (!entry) throw new HttpError(404, 'Página no descargada')
     return sendCbzEntry(res, local.file, entry)
@@ -841,6 +850,7 @@ async function route(req, res) {
 }
 
 const features = setupFeatures({ db, fetchMangaFull, enqueueDownload, downloadInfo, HttpError, json, readBody, MANGA_ID })
+const upscale = setupUpscale({ db, MANGA_DIR, HttpError, json, readBody, MANGA_ID })
 
 // Migración: portadas guardadas antes de firmar las URLs del proxy.
 for (const row of db.prepare("SELECT user_id, manga_id, cover FROM progress WHERE cover LIKE '/api/img?u=%' AND cover NOT LIKE '%&s=%'").all()) {