Audible: switch to JSON catalog API

Move Audible catalog operations from HTML scraping to Audible's unauthenticated JSON catalog API (/1.0/catalog/*) while keeping Audnexus as the primary per‑ASIN detail source. audible.service.ts: remove cheerio parsing, add apiClient/htmlClient split, CATALOG_RESPONSE_GROUPS constant, catalog response types, stripHtml and mapCatalogProduct mappers, and paging (API is 0-indexed) + author-ASIN client-side filtering. Update search, popular, new-releases and author endpoints to call the catalog API, use apiClient for retries/backoff, and preserve htmlClient only for series-page scraping and link generation. Improve retry logic to accept an Axios client, move to jittered/exponential backoff for API/external calls, and adjust delays/AdaptivePacer usage. Documentation updated to reflect architecture, data sources, region handling, and gotchas.

src/lib/types/audible.ts

@@ -11,6 +11,7 @@ export interface AudibleRegionConfig {
   code: AudibleRegion;
   name: string;
   baseUrl: string;
+  apiBaseUrl: string;
   audnexusParam: string;
   language: SupportedLanguage;
 }
@@ -20,6 +21,7 @@ export const AUDIBLE_REGIONS: Record<AudibleRegion, AudibleRegionConfig> = {
     code: 'us',
     name: 'United States',
     baseUrl: 'https://www.audible.com',
+    apiBaseUrl: 'https://api.audible.com',
     audnexusParam: 'us',
     language: 'en',
   },
@@ -27,6 +29,7 @@ export const AUDIBLE_REGIONS: Record<AudibleRegion, AudibleRegionConfig> = {
     code: 'ca',
     name: 'Canada',
     baseUrl: 'https://www.audible.ca',
+    apiBaseUrl: 'https://api.audible.ca',
     audnexusParam: 'ca',
     language: 'en',
   },
@@ -34,6 +37,7 @@ export const AUDIBLE_REGIONS: Record<AudibleRegion, AudibleRegionConfig> = {
     code: 'uk',
     name: 'United Kingdom',
     baseUrl: 'https://www.audible.co.uk',
+    apiBaseUrl: 'https://api.audible.co.uk',
     audnexusParam: 'uk',
     language: 'en',
   },
@@ -41,6 +45,7 @@ export const AUDIBLE_REGIONS: Record<AudibleRegion, AudibleRegionConfig> = {
     code: 'au',
     name: 'Australia',
     baseUrl: 'https://www.audible.com.au',
+    apiBaseUrl: 'https://api.audible.com.au',
     audnexusParam: 'au',
     language: 'en',
   },
@@ -48,6 +53,7 @@ export const AUDIBLE_REGIONS: Record<AudibleRegion, AudibleRegionConfig> = {
     code: 'in',
     name: 'India',
     baseUrl: 'https://www.audible.in',
+    apiBaseUrl: 'https://api.audible.in',
     audnexusParam: 'in',
     language: 'en',
   },
@@ -55,6 +61,7 @@ export const AUDIBLE_REGIONS: Record<AudibleRegion, AudibleRegionConfig> = {
     code: 'de',
     name: 'Germany',
     baseUrl: 'https://www.audible.de',
+    apiBaseUrl: 'https://api.audible.de',
     audnexusParam: 'de',
     language: 'de',
   },
@@ -62,6 +69,7 @@ export const AUDIBLE_REGIONS: Record<AudibleRegion, AudibleRegionConfig> = {
     code: 'es',
     name: 'Spain',
     baseUrl: 'https://www.audible.es',
+    apiBaseUrl: 'https://api.audible.es',
     audnexusParam: 'es',
     language: 'es',
   },
@@ -69,9 +77,10 @@ export const AUDIBLE_REGIONS: Record<AudibleRegion, AudibleRegionConfig> = {
     code: 'fr',
     name: 'France',
     baseUrl: 'https://www.audible.fr',
+    apiBaseUrl: 'https://api.audible.fr',
     audnexusParam: 'fr',
     language: 'fr',
-  }
+  },
 };
 
 export const DEFAULT_AUDIBLE_REGION: AudibleRegion = 'us';