feat(api,shared): métadonnées multi-providers et automatisation des scans/enrichissements

Chaîne de résolution metadata (local, Open Library, Google Books, BNF)
avec activation/priorité/clé API par provider, colonnes isbn13 et
identifiers sur les livres, et intégration au scanner pour compléter
métadonnées et jaquettes manquantes. Module automation: réglages
persistés, planifications scan/enrichissement et déclenchement manuel,
exposés via des endpoints admin.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/api/src/metadata/adapters/open-library.provider.ts

@@ -0,0 +1,33 @@
+import { Injectable } from "@nestjs/common";
+import { MetadataLookup, MetadataMatch, MetadataProvider, MetadataProviderConfig } from "../metadata.types.js";
+
+@Injectable()
+export class OpenLibraryProvider implements MetadataProvider {
+  readonly id = "openlibrary" as const;
+
+  async lookup(lookup: MetadataLookup, _config: MetadataProviderConfig): Promise<MetadataMatch | null> {
+    const query = lookup.identifiers.isbn13
+      ? `isbn:${encodeURIComponent(lookup.identifiers.isbn13)}`
+      : `title:${encodeURIComponent(lookup.title)}${lookup.author ? ` author:${encodeURIComponent(lookup.author)}` : ""}`;
+    const response = await fetch(`https://openlibrary.org/search.json?q=${query}&limit=1`, {
+      headers: { "User-Agent": "ReadaBook/0.1 local-library-manager" },
+      signal: AbortSignal.timeout(4000)
+    });
+    if (!response.ok) return null;
+    const data = (await response.json()) as { docs?: Array<Record<string, unknown>> };
+    const doc = data.docs?.[0];
+    if (!doc) return null;
+    return {
+      author: firstArrayValue(doc.author_name),
+      language: firstArrayValue(doc.language),
+      publisher: firstArrayValue(doc.publisher),
+      publishedDate: String(doc.first_publish_year ?? "") || null,
+      isbn: firstArrayValue(doc.isbn)
+    };
+  }
+}
+
+function firstArrayValue(value: unknown): string | null {
+  if (!Array.isArray(value) || !value.length) return null;
+  return String(value[0]);
+}