docs: complete API keys documentation in README.md
Documentation Enhancement: - Add missing TVDB_API_KEY to all relevant sections in README.md - Create comprehensive API keys reference table with purposes and sources - Add centralized API Keys Configuration section with clear examples - Document how to resolve "TVDB API key not configured" warnings - Include direct links to obtain API keys from each service API Keys Covered: - TMDB_API_KEY - Movie release dates and metadata fallbacks - TVDB_API_KEY - TV show metadata and Emby compatibility (was missing!) - RADARR_API_KEY - Movie import history and database access - SONARR_API_KEY - TV episode import history This resolves user questions about the TVDB API key warning and provides complete documentation for all external API integrations.
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