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/bnf.provider.ts

@@ -0,0 +1,38 @@
+import { Injectable } from "@nestjs/common";
+import { XMLParser } from "fast-xml-parser";
+import { MetadataLookup, MetadataMatch, MetadataProvider, MetadataProviderConfig } from "../metadata.types.js";
+
+const parser = new XMLParser({ ignoreAttributes: false, attributeNamePrefix: "@_" });
+
+@Injectable()
+export class BnfProvider implements MetadataProvider {
+  readonly id = "bnf" as const;
+
+  async lookup(lookup: MetadataLookup, _config: MetadataProviderConfig): Promise<MetadataMatch | null> {
+    const query = lookup.identifiers.isbn13
+      ? `bib.isbn all "${lookup.identifiers.isbn13}"`
+      : `bib.title all "${lookup.title.replace(/"/g, " ")}"`;
+    const url = new URL("https://catalogue.bnf.fr/api/SRU");
+    url.searchParams.set("version", "1.2");
+    url.searchParams.set("operation", "searchRetrieve");
+    url.searchParams.set("query", query);
+    url.searchParams.set("maximumRecords", "1");
+
+    const response = await fetch(url, { signal: AbortSignal.timeout(5000) });
+    if (!response.ok) return null;
+    const parsed = parser.parse(await response.text());
+    const record = parsed?.searchRetrieveResponse?.records?.record?.recordData;
+    if (!record) return null;
+    const text = JSON.stringify(record);
+    return {
+      title: match(text, /"titleInfo"[^}]*"title":"([^"]+)"/),
+      author: match(text, /"namePart":"([^"]+)"/),
+      publisher: match(text, /"publisher":"([^"]+)"/),
+      publishedDate: match(text, /"dateIssued":"([^"]+)"/)
+    };
+  }
+}
+
+function match(value: string, pattern: RegExp): string | undefined {
+  return value.match(pattern)?.[1];
+}