Display total VOD duration from provider metadata and stream probes

Adapted from MikaelKW/nodecast-tv-plus commit 9c6416cdba40813d44d21c8d76e31e4d9ab3155f.

Co-authored-by: Mikael <mikaelkwessel@gmail.com>

server/routes/probe.js

@@ -133,6 +133,8 @@ function analyzeProbeResult(probeResult, url) {
     return {
         video: videoCodec,
         audio: audioCodec,
+        duration: Number.isFinite(Number(format.duration)) && Number(format.duration) > 0
+            ? Number(format.duration) : 0,
         audioCodecs: streams.filter(s => s.codec_type === 'audio')
             .map(s => s.codec_name?.toLowerCase() || 'unknown'),
         width: videoStream?.width || 0,