audible: enforce English locale and fix redirects

Add English-locale enforcement and locale-redirect handling for the Audible integration. Adds Cookie 'lc-acbus=en_US' to Audible client headers and implements handleLocaleRedirect(...) in src/lib/integrations/audible.service.ts to detect non-English culture codes in response URLs, parse Audible's <adbl-toggle-chip> locale picker to obtain the canonical English URL and re-request it, with a fallback URL rewrite (strip culture code + language=en_US). Wire the correction into fetchWithRetry so responses redirected to locale-specific pages are corrected before use. Update documentation (documentation/integrations/audible.md) to describe the behavior and bump package version to 1.0.1.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "readmeabook",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "private": true,
   "scripts": {
     "dev": "next dev",