Add language config and locale-aware parsing

Introduce centralized language configuration and wire locale-aware behavior across scraping and ranking. Adds src/lib/constants/language-config.ts with per-language scraping rules, stop words, and character replacements; replaces AudibleRegion.isEnglish with a language field in types and AUDIBLE_REGIONS. Update AudibleService, ebook scraper, processors, and API routes to use getLanguageForRegion so Anna's Archive searches, scraping selectors, runtime/rating parsing, and ranking use language-specific params and filters. Extend ranking algorithm to accept stopWords and characterReplacements and apply them during normalization and matching. Update UI selects to mark non-English regions and adjust tests accordingly.

src/lib/types/audible.ts

@@ -3,6 +3,8 @@
  * Documentation: documentation/integrations/audible.md
  */
 
+import type { SupportedLanguage } from '../constants/language-config';
+
 export type AudibleRegion = 'us' | 'ca' | 'uk' | 'au' | 'in' | 'de' | 'es';
 
 export interface AudibleRegionConfig {
@@ -10,7 +12,7 @@ export interface AudibleRegionConfig {
   name: string;
   baseUrl: string;
   audnexusParam: string;
-  isEnglish: boolean;
+  language: SupportedLanguage;
 }
 
 export const AUDIBLE_REGIONS: Record<AudibleRegion, AudibleRegionConfig> = {
@@ -19,49 +21,49 @@ export const AUDIBLE_REGIONS: Record<AudibleRegion, AudibleRegionConfig> = {
     name: 'United States',
     baseUrl: 'https://www.audible.com',
     audnexusParam: 'us',
-    isEnglish: true,
+    language: 'en',
   },
   ca: {
     code: 'ca',
     name: 'Canada',
     baseUrl: 'https://www.audible.ca',
     audnexusParam: 'ca',
-    isEnglish: true,
+    language: 'en',
   },
   uk: {
     code: 'uk',
     name: 'United Kingdom',
     baseUrl: 'https://www.audible.co.uk',
     audnexusParam: 'uk',
-    isEnglish: true,
+    language: 'en',
   },
   au: {
     code: 'au',
     name: 'Australia',
     baseUrl: 'https://www.audible.com.au',
     audnexusParam: 'au',
-    isEnglish: true,
+    language: 'en',
   },
   in: {
     code: 'in',
     name: 'India',
     baseUrl: 'https://www.audible.in',
     audnexusParam: 'in',
-    isEnglish: true,
+    language: 'en',
   },
   de: {
     code: 'de',
     name: 'Germany',
     baseUrl: 'https://www.audible.de',
     audnexusParam: 'de',
-    isEnglish: false,
+    language: 'de',
   },
   es: {
     code: 'es',
     name: 'Spain',
     baseUrl: 'https://www.audible.es',
     audnexusParam: 'es',
-    isEnglish: false,
+    language: 'es',
   }
 };