Add series browsing, search, and detail UI

Introduce full support for Audible series exploration: API routes, frontend pages, components, hooks, and integrations. Key changes:

- Prisma: add Audiobook.seriesAsin for linking audiobooks to series detail pages.
- Backend: add /api/series/search and /api/series/[asin] routes that require auth; scrape Audible series data and enrich books with library availability.
- Integrations/services: add audible-series integration and update request/HTTP services to support the workflow.
- Frontend: add /series and /series/[asin] pages, new components (SeriesCard, SeriesGrid, SeriesDetailCard, SimilarSeriesRow) and wire them to a new useSeries hook; update AudiobookDetailsModal to show/link series; add Series link to Header.
- Misc: extend audiobook types with series fields and add seriesLabels to language-config for scraping.

These changes enable users to search for series, view series metadata and books, and navigate between audiobook and series detail pages.

src/lib/constants/language-config.ts

@@ -31,6 +31,8 @@ export interface ScrapingConfig {
   languageLabels: string[];
   /** Release date field labels */
   releaseDateLabels: string[];
+  /** Series label prefixes used to find series links in search results */
+  seriesLabels: string[];
   /** Accepted language values for filtering (lowercase) */
   acceptedLanguageValues: string[];
   /** Regex patterns that match hour portions in runtime strings */
@@ -80,6 +82,7 @@ const ENGLISH_CONFIG: LanguageConfig = {
     lengthLabels: ['Length:'],
     languageLabels: ['Language:'],
     releaseDateLabels: ['Release date:'],
+    seriesLabels: ['Series:'],
     acceptedLanguageValues: ['english'],
     runtimeHourPatterns: [/(\d+)\s*hrs?/i, /(\d+)\s*hours?/i],
     runtimeMinutePatterns: [/(\d+)\s*mins?/i, /(\d+)\s*minutes?/i],
@@ -112,6 +115,7 @@ const GERMAN_CONFIG: LanguageConfig = {
     lengthLabels: ['Spieldauer:', 'Dauer:', 'L\u00e4nge:'],
     languageLabels: ['Sprache:'],
     releaseDateLabels: ['Erscheinungsdatum:'],
+    seriesLabels: ['Serie:', 'Reihe:'],
     acceptedLanguageValues: ['deutsch', 'german'],
     runtimeHourPatterns: [/(\d+)\s*Std\.?/i, /(\d+)\s*Stunden?/i],
     runtimeMinutePatterns: [/(\d+)\s*Min\.?/i, /(\d+)\s*Minuten?/i],
@@ -145,6 +149,7 @@ const SPANISH_CONFIG: LanguageConfig = {
     lengthLabels: ['Duraci\u00f3n:'],
     languageLabels: ['Idioma:'],
     releaseDateLabels: ['Fecha de lanzamiento:'],
+    seriesLabels: ['Serie:'],
     acceptedLanguageValues: ['espa\u00f1ol', 'spanish'],
     runtimeHourPatterns: [/(\d+)\s*h\b/i, /(\d+)\s*horas?/i],
     runtimeMinutePatterns: [/(\d+)\s*min/i, /(\d+)\s*minutos?/i],