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/cliUtils.js

@@ -0,0 +1,42 @@
+'use strict';
+/**
+ * Local mock of Tdarr FlowHelpers/1.0.0/cliUtils.js
+ * Used only for local testing — on real Tdarr this file comes from the server.
+ */
+const { spawn } = require('child_process');
+
+class CLI {
+  constructor(config) {
+    this.config = config;
+  }
+
+  runCli() {
+    return new Promise((resolve) => {
+      const { cli, spawnArgs, WorkDir, jobLog } = this.config;
+
+      if (jobLog) jobLog(`[CLI] Running: ${cli} ${spawnArgs.join(' ')}\n`);
+
+      const proc = spawn(cli, spawnArgs, {
+        cwd: WorkDir || process.cwd(),
+        stdio: ['ignore', 'pipe', 'pipe'],
+        shell: false,
+      });
+
+      proc.stdout.on('data', (d) => { if (jobLog) jobLog(d.toString()); });
+      proc.stderr.on('data', (d) => { if (jobLog) jobLog(d.toString()); });
+
+      proc.on('close', (code) => {
+        resolve({ cliExitCode: code || 0 });
+      });
+
+      proc.on('error', (err) => {
+        if (jobLog) jobLog(`[CLI] Error: ${err.message}\n`);
+        resolve({ cliExitCode: 1 });
+      });
+    });
+  }
+}
+
+const getFFmpegVar = () => {};
+
+module.exports = { CLI, getFFmpegVar };