fix: Rename duplicate extractTXTMetadata in txt-parser

Fix infinite recursion bug where exported function called itself.
Renamed to getTXTMetadata to avoid duplicate declaration.

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

@@ -114,7 +114,7 @@ function escapeHTML(text: string): string {
 // Metadata Quick Extract
 // ============================================================
 
-export async function extractTXTMetadata(
+export async function getTXTMetadata(
   txtBlob: Blob,
 ): Promise<Partial<EbookCIF["metadata"]>> {
   return extractTXTMetadata(txtBlob);