feat: add authors page to backoffice with dedicated API endpoint

Add a new GET /authors endpoint that aggregates unique authors from books
with book/series counts, pagination and search. Add author filter to
GET /books. Backoffice gets a list page with search/sort and a detail
page showing the author's series and books.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/backoffice/app/authors/[name]/page.tsx

@@ -0,0 +1,142 @@
+import { fetchBooks, fetchAllSeries, BooksPageDto, SeriesPageDto, getBookCoverUrl } from "../../../lib/api";
+import { getServerTranslations } from "../../../lib/i18n/server";
+import { BooksGrid } from "../../components/BookCard";
+import { OffsetPagination } from "../../components/ui";
+import Image from "next/image";
+import Link from "next/link";
+
+export const dynamic = "force-dynamic";
+
+export default async function AuthorDetailPage({
+  params,
+  searchParams,
+}: {
+  params: Promise<{ name: string }>;
+  searchParams: Promise<{ [key: string]: string | string[] | undefined }>;
+}) {
+  const { t } = await getServerTranslations();
+  const { name: encodedName } = await params;
+  const authorName = decodeURIComponent(encodedName);
+  const searchParamsAwaited = await searchParams;
+  const page = typeof searchParamsAwaited.page === "string" ? parseInt(searchParamsAwaited.page) : 1;
+  const limit = typeof searchParamsAwaited.limit === "string" ? parseInt(searchParamsAwaited.limit) : 20;
+
+  // Fetch books by this author (server-side filtering via API) and series
+  const [booksPage, seriesPage] = await Promise.all([
+    fetchBooks(undefined, undefined, page, limit, undefined, undefined, authorName).catch(
+      () => ({ items: [], total: 0, page: 1, limit }) as BooksPageDto
+    ),
+    fetchAllSeries(undefined, undefined, undefined, 1, 200).catch(
+      () => ({ items: [], total: 0, page: 1, limit: 200 }) as SeriesPageDto
+    ),
+  ]);
+
+  const totalPages = Math.ceil(booksPage.total / limit);
+
+  // Extract unique series names from this author's books
+  const authorSeriesNames = new Set(
+    booksPage.items
+      .map((b) => b.series)
+      .filter((s): s is string => s != null && s !== "")
+  );
+
+  const authorSeries = seriesPage.items.filter((s) => authorSeriesNames.has(s.name));
+
+  return (
+    <>
+      {/* Breadcrumb */}
+      <nav className="flex items-center gap-2 text-sm text-muted-foreground mb-6">
+        <Link href="/authors" className="hover:text-foreground transition-colors">
+          {t("authors.title")}
+        </Link>
+        <span>/</span>
+        <span className="text-foreground font-medium">{authorName}</span>
+      </nav>
+
+      {/* Author Header */}
+      <div className="flex items-center gap-4 mb-8">
+        <div className="w-16 h-16 rounded-full bg-accent/50 flex items-center justify-center flex-shrink-0">
+          <span className="text-2xl font-bold text-accent-foreground">
+            {authorName.charAt(0).toUpperCase()}
+          </span>
+        </div>
+        <div>
+          <h1 className="text-3xl font-bold text-foreground">{authorName}</h1>
+          <div className="flex items-center gap-4 mt-1">
+            <span className="text-sm text-muted-foreground">
+              {t("authors.bookCount", { count: String(booksPage.total), plural: booksPage.total !== 1 ? "s" : "" })}
+            </span>
+            {authorSeries.length > 0 && (
+              <span className="text-sm text-muted-foreground">
+                {t("authors.seriesCount", { count: String(authorSeries.length), plural: authorSeries.length !== 1 ? "s" : "" })}
+              </span>
+            )}
+          </div>
+        </div>
+      </div>
+
+      {/* Series Section */}
+      {authorSeries.length > 0 && (
+        <section className="mb-8">
+          <h2 className="text-xl font-semibold text-foreground mb-4">
+            {t("authors.seriesBy", { name: authorName })}
+          </h2>
+          <div className="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-5 xl:grid-cols-6 gap-4">
+            {authorSeries.map((s) => (
+              <Link
+                key={`${s.library_id}-${s.name}`}
+                href={`/libraries/${s.library_id}/series/${encodeURIComponent(s.name)}`}
+                className="group"
+              >
+                <div className="bg-card rounded-xl shadow-sm border border-border/60 overflow-hidden hover:shadow-md hover:-translate-y-1 transition-all duration-200">
+                  <div className="aspect-[2/3] relative bg-muted/50">
+                    <Image
+                      src={getBookCoverUrl(s.first_book_id)}
+                      alt={s.name}
+                      fill
+                      className="object-cover"
+                      unoptimized
+                    />
+                  </div>
+                  <div className="p-3">
+                    <h3 className="font-medium text-foreground truncate text-sm" title={s.name}>
+                      {s.name}
+                    </h3>
+                    <p className="text-xs text-muted-foreground mt-1">
+                      {t("authors.bookCount", { count: String(s.book_count), plural: s.book_count !== 1 ? "s" : "" })}
+                    </p>
+                  </div>
+                </div>
+              </Link>
+            ))}
+          </div>
+        </section>
+      )}
+
+      {/* Books Section */}
+      {booksPage.items.length > 0 && (
+        <section>
+          <h2 className="text-xl font-semibold text-foreground mb-4">
+            {t("authors.booksBy", { name: authorName })}
+          </h2>
+          <BooksGrid books={booksPage.items} />
+          <OffsetPagination
+            currentPage={page}
+            totalPages={totalPages}
+            pageSize={limit}
+            totalItems={booksPage.total}
+          />
+        </section>
+      )}
+
+      {/* Empty State */}
+      {booksPage.items.length === 0 && authorSeries.length === 0 && (
+        <div className="flex flex-col items-center justify-center py-16 text-center">
+          <p className="text-muted-foreground text-lg">
+            {t("authors.noResults")}
+          </p>
+        </div>
+      )}
+    </>
+  );
+}

apps/backoffice/app/authors/page.tsx

@@ -0,0 +1,122 @@
+import { fetchAuthors, AuthorsPageDto } from "../../lib/api";
+import { getServerTranslations } from "../../lib/i18n/server";
+import { LiveSearchForm } from "../components/LiveSearchForm";
+import { Card, CardContent, OffsetPagination } from "../components/ui";
+import Link from "next/link";
+
+export const dynamic = "force-dynamic";
+
+export default async function AuthorsPage({
+  searchParams,
+}: {
+  searchParams: Promise<{ [key: string]: string | string[] | undefined }>;
+}) {
+  const { t } = await getServerTranslations();
+  const searchParamsAwaited = await searchParams;
+  const searchQuery = typeof searchParamsAwaited.q === "string" ? searchParamsAwaited.q : "";
+  const sort = typeof searchParamsAwaited.sort === "string" ? searchParamsAwaited.sort : undefined;
+  const page = typeof searchParamsAwaited.page === "string" ? parseInt(searchParamsAwaited.page) : 1;
+  const limit = typeof searchParamsAwaited.limit === "string" ? parseInt(searchParamsAwaited.limit) : 20;
+
+  const authorsPage = await fetchAuthors(
+    searchQuery || undefined,
+    page,
+    limit,
+    sort,
+  ).catch(() => ({ items: [], total: 0, page: 1, limit }) as AuthorsPageDto);
+
+  const totalPages = Math.ceil(authorsPage.total / limit);
+  const hasFilters = searchQuery || sort;
+
+  const sortOptions = [
+    { value: "", label: t("authors.sortName") },
+    { value: "books", label: t("authors.sortBooks") },
+  ];
+
+  return (
+    <>
+      <div className="mb-6">
+        <h1 className="text-3xl font-bold text-foreground flex items-center gap-3">
+          <svg className="w-8 h-8 text-violet-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M17 20h5v-2a3 3 0 00-5.356-1.857M17 20H7m10 0v-2c0-.656-.126-1.283-.356-1.857M7 20H2v-2a3 3 0 015.356-1.857M7 20v-2c0-.656.126-1.283.356-1.857m0 0a5.002 5.002 0 019.288 0M15 7a3 3 0 11-6 0 3 3 0 016 0zm6 3a2 2 0 11-4 0 2 2 0 014 0zM7 10a2 2 0 11-4 0 2 2 0 014 0z" />
+          </svg>
+          {t("authors.title")}
+        </h1>
+      </div>
+
+      <Card className="mb-6">
+        <CardContent className="pt-6">
+          <LiveSearchForm
+            basePath="/authors"
+            fields={[
+              { name: "q", type: "text", label: t("common.search"), placeholder: t("authors.searchPlaceholder") },
+              { name: "sort", type: "select", label: t("books.sort"), options: sortOptions },
+            ]}
+          />
+        </CardContent>
+      </Card>
+
+      {/* Results count */}
+      <p className="text-sm text-muted-foreground mb-4">
+        {authorsPage.total} {t("authors.title").toLowerCase()}
+        {searchQuery && <> {t("authors.matchingQuery")} &quot;{searchQuery}&quot;</>}
+      </p>
+
+      {/* Authors List */}
+      {authorsPage.items.length > 0 ? (
+        <>
+          <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 gap-4">
+            {authorsPage.items.map((author) => (
+              <Link
+                key={author.name}
+                href={`/authors/${encodeURIComponent(author.name)}`}
+                className="group"
+              >
+                <div className="bg-card rounded-xl shadow-sm border border-border/60 overflow-hidden hover:shadow-md hover:-translate-y-1 transition-all duration-200 p-4">
+                  <div className="flex items-center gap-3">
+                    <div className="w-10 h-10 rounded-full bg-accent/50 flex items-center justify-center flex-shrink-0">
+                      <span className="text-lg font-semibold text-violet-500">
+                        {author.name.charAt(0).toUpperCase()}
+                      </span>
+                    </div>
+                    <div className="min-w-0">
+                      <h3 className="font-medium text-foreground truncate text-sm group-hover:text-violet-500 transition-colors" title={author.name}>
+                        {author.name}
+                      </h3>
+                      <div className="flex items-center gap-3 mt-0.5">
+                        <span className="text-xs text-muted-foreground">
+                          {t("authors.bookCount", { count: String(author.book_count), plural: author.book_count !== 1 ? "s" : "" })}
+                        </span>
+                        <span className="text-xs text-muted-foreground">
+                          {t("authors.seriesCount", { count: String(author.series_count), plural: author.series_count !== 1 ? "s" : "" })}
+                        </span>
+                      </div>
+                    </div>
+                  </div>
+                </div>
+              </Link>
+            ))}
+          </div>
+
+          <OffsetPagination
+            currentPage={page}
+            totalPages={totalPages}
+            pageSize={limit}
+            totalItems={authorsPage.total}
+          />
+        </>
+      ) : (
+        <div className="flex flex-col items-center justify-center py-16 text-center">
+          <div className="w-16 h-16 mb-4 text-muted-foreground/30">
+            <svg fill="none" stroke="currentColor" viewBox="0 0 24 24">
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={1.5} d="M17 20h5v-2a3 3 0 00-5.356-1.857M17 20H7m10 0v-2c0-.656-.126-1.283-.356-1.857M7 20H2v-2a3 3 0 015.356-1.857M7 20v-2c0-.656.126-1.283.356-1.857m0 0a5.002 5.002 0 019.288 0M15 7a3 3 0 11-6 0 3 3 0 016 0zm6 3a2 2 0 11-4 0 2 2 0 014 0zM7 10a2 2 0 11-4 0 2 2 0 014 0z" />
+            </svg>
+          </div>
+          <p className="text-muted-foreground text-lg">
+            {hasFilters ? t("authors.noResults") : t("authors.noAuthors")}
+          </p>
+        </div>
+      )}
+    </>
+  );
+}