feat: suppression de série entière (dossier + livres + métadonnées)

Backend:
- Ajoute DELETE /libraries/:id/series/:name dans series.rs
- Supprime tous les fichiers physiques des livres de la série
- Supprime le dossier de la série (remove_dir_all)
- Nettoie en DB : books, series_metadata, external_metadata_links,
  anilist_series_links, available_downloads
- Queue un scan job pour cohérence

Frontend:
- Crée DeleteSeriesButton.tsx avec modale de confirmation
- Ajouté dans la toolbar de la page détail série
- i18n fr/en pour les textes de confirmation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/backoffice/app/(app)/libraries/[id]/series/[name]/page.tsx

@@ -21,6 +21,9 @@ const ReadingStatusModal = nextDynamic(
 const ProwlarrSearchModal = nextDynamic(
   () => import("@/app/components/ProwlarrSearchModal").then(m => m.ProwlarrSearchModal)
 );
+const DeleteSeriesButton = nextDynamic(
+  () => import("@/app/components/DeleteSeriesButton").then(m => m.DeleteSeriesButton)
+);
 import { notFound } from "next/navigation";
 import { getServerTranslations } from "@/lib/i18n/server";
 
@@ -262,6 +265,10 @@ export default async function SeriesDetailPage({
               readingStatusProvider={library.reading_status_provider ?? null}
               existingLink={readingStatusLink}
             />
+            <DeleteSeriesButton
+              libraryId={id}
+              seriesName={seriesName}
+            />
           </div>
         </div>
       </div>

apps/backoffice/app/components/DeleteSeriesButton.tsx

@@ -0,0 +1,62 @@
+"use client";
+
+import { useState } from "react";
+import { useRouter } from "next/navigation";
+import { Button, Icon, Modal } from "./ui";
+import { useTranslation } from "@/lib/i18n/context";
+
+export function DeleteSeriesButton({ libraryId, seriesName }: { libraryId: string; seriesName: string }) {
+  const { t } = useTranslation();
+  const router = useRouter();
+  const [showConfirm, setShowConfirm] = useState(false);
+  const [deleting, setDeleting] = useState(false);
+
+  async function handleDelete() {
+    setDeleting(true);
+    setShowConfirm(false);
+    try {
+      const resp = await fetch(
+        `/api/libraries/${libraryId}/series/${encodeURIComponent(seriesName)}`,
+        { method: "DELETE" }
+      );
+      if (resp.ok) {
+        router.push(`/libraries/${libraryId}/series`);
+      }
+    } finally {
+      setDeleting(false);
+    }
+  }
+
+  return (
+    <>
+      <Button
+        variant="destructive"
+        size="sm"
+        onClick={() => setShowConfirm(true)}
+        disabled={deleting}
+      >
+        {deleting ? <Icon name="spinner" size="sm" className="animate-spin" /> : <Icon name="trash" size="sm" />}
+        <span className="ml-1.5">{t("seriesDetail.delete")}</span>
+      </Button>
+
+      <Modal isOpen={showConfirm} onClose={() => setShowConfirm(false)} maxWidth="sm">
+        <div className="p-6">
+          <h3 className="text-lg font-semibold text-foreground mb-2">
+            {t("seriesDetail.delete")}
+          </h3>
+          <p className="text-sm text-muted-foreground">
+            {t("seriesDetail.confirmDelete")}
+          </p>
+        </div>
+        <div className="flex justify-end gap-2 px-6 pb-6">
+          <Button variant="outline" size="sm" onClick={() => setShowConfirm(false)}>
+            {t("common.cancel")}
+          </Button>
+          <Button variant="destructive" size="sm" onClick={handleDelete}>
+            {t("seriesDetail.delete")}
+          </Button>
+        </div>
+      </Modal>
+    </>
+  );
+}

apps/backoffice/lib/i18n/en.ts

@@ -764,6 +764,8 @@ const en: Record<TranslationKey, string> = {
   "bookDetail.updatedAt": "Updated",
   "bookDetail.delete": "Delete",
   "bookDetail.confirmDelete": "The file will be permanently deleted from disk. This action cannot be undone.",
+  "seriesDetail.delete": "Delete series",
+  "seriesDetail.confirmDelete": "All books and the series folder will be permanently deleted from disk. This action cannot be undone.",
 
   // Book preview
   "bookPreview.preview": "Preview",

apps/backoffice/lib/i18n/fr.ts

@@ -762,6 +762,8 @@ const fr = {
   "bookDetail.updatedAt": "Mis à jour",
   "bookDetail.delete": "Supprimer",
   "bookDetail.confirmDelete": "Le fichier sera définitivement supprimé du disque. Cette action est irréversible.",
+  "seriesDetail.delete": "Supprimer la série",
+  "seriesDetail.confirmDelete": "Tous les livres et le dossier de la série seront définitivement supprimés du disque. Cette action est irréversible.",
 
   // Book preview
   "bookPreview.preview": "Aperçu",