feat: Tdarr Local Flow Plugin Suite v1.0

7 atomic plugins for automated x265 transcoding pipeline:
- utility/mediaAnalyzerGOP    : GOP calc, FPS detection, film/series/anime routing
- utility/setAnimationFlag    : manual animation flag override
- utility/extractChaptersXml  : mkvextract chapters to XML
- audio/audioSelectorClamping : codec scoring, clamped Opus bitrates, 2 outputs
- audio/backupSourceAudio     : lossless DTS/TrueHD ITA backup (-c:a copy)
- subtitles/extractSubtitlesAndOcr : SRT extract + SubtitleEdit OCR for PGS
- video/transcode2PassX265    : 2-pass x265, Lanczos 1080p bound, Opus mux

Test suite: 34 unit tests + 3 integration tests (FFmpeg real files)
FlowHelpers mock for local testing included
Docs: integration-guide.md with canvas wiring and deploy instructions

FlowHelpers/1.0.0/fileUtils.js

@@ -0,0 +1,12 @@
+'use strict';
+/**
+ * Local mock of Tdarr FlowHelpers/1.0.0/fileUtils.js
+ */
+const fs   = require('fs');
+const path = require('path');
+
+const moveFile = (src, dest) => fs.renameSync(src, dest);
+const copyFile = (src, dest) => fs.copyFileSync(src, dest);
+const getFileSize = (fp) => { try { return fs.statSync(fp).size; } catch(_) { return 0; } };
+
+module.exports = { moveFile, copyFile, getFileSize };