feat: author pages with /authors/:id route (0.16.0)

- `GET /v1/authors/:id` returns `AuthorWithCount` (id, name, manga_count).
- `GET /v1/authors/:id/mangas` paged works by that author.
- `GET /v1/authors?search=` autocomplete (already used by Phase 1 forms;
  now formally exposed).
- New `/authors/:id` page on the frontend; author chips on the manga
  detail page (added in Phase 1) now link to a real page.
- Extracts `lib/components/MangaCard.svelte` — already used by the home
  page, ready for the collection page in Phase 3.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/routes/+page.svelte

@@ -5,20 +5,19 @@
     import { page } from '$app/stores';
     import {
         listMangas,
-        type MangaCard,
+        type MangaCard as MangaCardData,
         type MangaSort,
         type MangaStatus
     } from '$lib/api/mangas';
     import { listGenres, type Genre } from '$lib/api/genres';
     import { listTags, type Tag } from '$lib/api/tags';
-    import { fileUrl } from '$lib/api/client';
     import Chip from '$lib/components/Chip.svelte';
+    import MangaCard from '$lib/components/MangaCard.svelte';
     import Search from '@lucide/svelte/icons/search';
-    import BookImage from '@lucide/svelte/icons/book-image';
     import SlidersHorizontal from '@lucide/svelte/icons/sliders-horizontal';
     import Plus from '@lucide/svelte/icons/plus';
 
-    let mangas: MangaCard[] = $state([]);
+    let mangas: MangaCardData[] = $state([]);
     let search = $state('');
     let sort: MangaSort = $state('recent');
     let statusFilter = $state<'' | MangaStatus>('');
@@ -389,35 +388,7 @@
     {/if}
     <ul class="manga-grid" data-testid="manga-list">
         {#each mangas as m (m.id)}
-            <li class="manga-card">
-                <a href="/manga/{m.id}" class="cover-link" aria-hidden="true" tabindex="-1">
-                    {#if m.cover_image_path}
-                        <img
-                            src={fileUrl(m.cover_image_path)}
-                            alt=""
-                            class="cover"
-                            loading="lazy"
-                        />
-                    {:else}
-                        <div class="cover cover-placeholder">
-                            <BookImage size={36} aria-hidden="true" />
-                        </div>
-                    {/if}
-                </a>
-                <div class="meta">
-                    <a href="/manga/{m.id}" class="title">{m.title}</a>
-                    {#if m.authors.length > 0}
-                        <span class="author">
-                            {m.authors.map((a) => a.name).join(', ')}
-                        </span>
-                    {/if}
-                    {#if m.genres.length > 0}
-                        <span class="genres">
-                            {m.genres.map((g) => g.name).join(' · ')}
-                        </span>
-                    {/if}
-                </div>
-            </li>
+            <MangaCard manga={m} authors={m.authors} genres={m.genres} />
         {/each}
     </ul>
 {/if}
@@ -648,64 +619,4 @@
         grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
         gap: var(--space-4);
     }
-
-    .manga-card {
-        display: flex;
-        flex-direction: column;
-        gap: var(--space-2);
-    }
-
-    .cover-link {
-        display: block;
-        line-height: 0;
-    }
-
-    .cover {
-        width: 100%;
-        aspect-ratio: 2 / 3;
-        object-fit: cover;
-        border-radius: var(--radius-md);
-        background: var(--surface);
-    }
-
-    .cover-placeholder {
-        display: flex;
-        align-items: center;
-        justify-content: center;
-        color: var(--text-muted);
-        user-select: none;
-    }
-
-    .meta {
-        display: flex;
-        flex-direction: column;
-        min-width: 0;
-        gap: var(--space-1);
-    }
-
-    .title {
-        font-weight: var(--weight-semibold);
-        font-size: var(--font-sm);
-        line-height: var(--leading-tight);
-        color: var(--text);
-        overflow: hidden;
-        display: -webkit-box;
-        -webkit-line-clamp: 2;
-        line-clamp: 2;
-        -webkit-box-orient: vertical;
-    }
-
-    .title:hover {
-        color: var(--primary);
-        text-decoration: none;
-    }
-
-    .author,
-    .genres {
-        color: var(--text-muted);
-        font-size: var(--font-xs);
-        white-space: nowrap;
-        overflow: hidden;
-        text-overflow: ellipsis;
-    }
 </style>