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The notification routes were using process.env.SONARR_URL directly, which is undefined when using the newer SONARR_INSTANCES JSON format. Changes: - Added getFirstSonarrInstance() and getFirstRadarrInstance() helpers - Updated /notifications, /notifications/test, and /notifications/sofarr-webhook routes to use instance config from getSonarrInstances()/getRadarrInstances() - Returns 503 error if no instances are configured Fixes: 'Invalid URL' errors when calling Sonarr/Radarr notification APIs