reader: implement Feature Registration Pattern infrastructure

- Add Feature Registry system in reader-shell.ts to track features
- Update format detection to use format_group with switch statement
- Add manga detection via library_type_name or manga_type fields
- Import and register features via init() functions on load
- Fix parser imports in parser-manager.ts (add missing function imports)
- Simplify epub-parsers and fb2-parser by removing unused imports

web/src/reader/parsers/epub-parsers.ts

@@ -1,13 +1,12 @@
 // EPUB Parser - Converts EPUB 2/3 to Common Intermediate Format
 // Procedural style: Functions, not classes
 
-import JSZip from 'jszip';
-
 // ============================================================
 // Main Parse Function
 // ============================================================
 
 export async function parseEPUB(epubBlob: Blob): Promise<EbookCIF> {
+  const JSZip = (await import('jszip')).default;
   const zip = await JSZip.loadAsync(epubBlob);
 
   // Parse container.xml to find OPF file
@@ -18,11 +17,9 @@ export async function parseEPUB(epubBlob: Blob): Promise<EbookCIF> {
     throw new Error('Invalid EPUB: no OPF file found');
   }
 
-  // Parse OPF file
   const opfXml = await getZipFileContent(zip, opfPath);
   const packageDoc = parseXML(opfXml);
 
-  // Extract all components
   const metadata = extractMetadata(packageDoc);
   const spine = parseSpine(packageDoc);
   const toc = await parseTOC(zip, packageDoc, opfPath);
@@ -48,7 +45,7 @@ export async function parseEPUB(epubBlob: Blob): Promise<EbookCIF> {
 // Helper Functions
 // ============================================================
 
-async function getZipFileContent(zip: JSZip, path: string): Promise<string> {
+async function getZipFileContent(zip: any, path: string): Promise<string> {
   const file = zip.file(path);
   if (!file) {
     throw new Error(`File not found: ${path}`);
@@ -113,7 +110,7 @@ function parseSpine(packageDoc: XMLDocument): EbookCIF['spine'] {
   return result;
 }
 
-async function parseTOC(zip: JSZip, packageDoc: XMLDocument, opfPath: string): Promise<EbookCIF['toc']> {
+async function parseTOC(zip: any, packageDoc: XMLDocument, opfPath: string): Promise<EbookCIF['toc']> {
   // Try EPUB 3.0 navigation document first
   const navItem = packageDoc.querySelector('manifest item[properties~="nav"]');
   if (navItem) {
@@ -140,7 +137,7 @@ async function parseTOC(zip: JSZip, packageDoc: XMLDocument, opfPath: string): P
   return [];
 }
 
-async function parseNavTOC(zip: JSZip, navPath: string): Promise<EbookCIF['toc']> {
+async function parseNavTOC(zip: any, navPath: string): Promise<EbookCIF['toc']> {
   const navXml = await getZipFileContent(zip, navPath);
   const navDoc = parseXML(navXml);
   const nav = navDoc.querySelector('nav');
@@ -168,7 +165,7 @@ async function parseNavTOC(zip: JSZip, navPath: string): Promise<EbookCIF['toc']
   return result;
 }
 
-async function parseNCXTOC(zip: JSZip, ncxPath: string): Promise<EbookCIF['toc']> {
+async function parseNCXTOC(zip: any, ncxPath: string): Promise<EbookCIF['toc']> {
   const ncxXml = await getZipFileContent(zip, ncxPath);
   const ncxDoc = parseXML(ncxXml);
   const navMap = ncxDoc.querySelector('navMap');
@@ -198,7 +195,7 @@ function parseNCXNode(node: Element): EbookCIF['toc'] {
   return result;
 }
 
-async function loadResources(zip: JSZip): Promise<Map<string, Blob>> {
+async function loadResources(zip: any): Promise<Map<string, Blob>> {
   const resources = new Map<string, Blob>();
   const files = Object.keys(zip.files);
 
@@ -213,7 +210,7 @@ async function loadResources(zip: JSZip): Promise<Map<string, Blob>> {
   return resources;
 }
 
-async function extractCover(zip: JSZip, packageDoc: XMLDocument): Promise<Blob | undefined> {
+async function extractCover(zip: any, packageDoc: XMLDocument): Promise<Blob | undefined> {
   // Try cover-id metadata
   const coverId = packageDoc.querySelector('meta[name="cover"]')?.getAttribute('content');
   if (coverId) {

web/src/reader/parsers/fb2-parser.ts

@@ -2,8 +2,6 @@
 // FB2 is XML-based, similar to EPUB structure
 // Procedural style: Functions, not classes
 
-import JSZip from "jszip";
-
 // ============================================================
 // Main Parse Function
 // ============================================================
@@ -16,6 +14,7 @@ export async function parseFB2(fb2Blob: Blob): Promise<EbookCIF> {
     fb2Blob.type === "application/zip" ||
     fb2Blob.type === "application/x-zip-compressed"
   ) {
+    const JSZip = (await import("jszip")).default;
     const zip = await JSZip.loadAsync(fb2Blob);
     const files = Object.keys(zip.files);
 
@@ -231,6 +230,7 @@ export async function getFB2Metadata(
     fb2Blob.type === "application/zip" ||
     fb2Blob.type === "application/x-zip-compressed"
   ) {
+    const JSZip = (await import("jszip")).default;
     const zip = await JSZip.loadAsync(fb2Blob);
     const files = Object.keys(zip.files);