refactor(reader): serve pages as static files instead of base64

Replace the per-page API call (base64 payload) with static image URLs
served directly by Caddy from public/images/pages/{chapterId}/.

- LocalImageStorage now stores to public/images/ (was MANGA_DATA_PATH)
- LegacyChapterRepository returns /images/pages/{id}/{file} URLs,
  uses getimagesize() instead of loading file content into memory
- Delete GetChapterPage query/handler/response, ChapterPageResource,
  ChapterPageProvider, PageContent model
- Remove getPageContent() from ChapterRepositoryInterface
- Frontend: loadChapter() fetches chapter + all pages in parallel,
  ReaderPage uses URL instead of base64 data URI, InfiniteReader drops
  lazy-load observer side effect, readerStore drops loadedPages/preload
- GetChapterPagesTest: extract fixture images from CBZ at runtime,
  ignore tests/Fixtures/pages/ in .gitignore

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

assets/vue/app/domain/reader/infrastructure/repository/ApiChapterRepository.js

@@ -9,7 +9,7 @@ export class ApiChapterRepository extends ChapterRepositoryInterface {
         return response.json();
     }
 
-    async getChapterPages(chapterId, page = 1, itemsPerPage = 20) {
+    async getChapterPages(chapterId, page = 1, itemsPerPage = 9999) {
         const response = await fetch(
             `/api/reader/chapter/${chapterId}/pages?page=${page}&itemsPerPage=${itemsPerPage}`
         );
@@ -18,12 +18,4 @@ export class ApiChapterRepository extends ChapterRepositoryInterface {
         }
         return response.json();
     }
-
-    async getChapterPage(chapterId, pageNumber) {
-        const response = await fetch(`/api/reader/chapter/${chapterId}/page/${pageNumber}`);
-        if (!response.ok) {
-            throw new Error('Failed to fetch chapter page');
-        }
-        return response.json();
-    }
 }