webapp: drop rig:playlist pipeline, source track count from mpc stats

The four overlays that read /data/playlist.js (loading, goodbye,
music-box, music/nc) only ever consumed `tracks.length` for cosmetic
"LIBRARY :: N TRACKS" / "indexed N tracks" flavor text — all live
playback signal flows through bridges/mpd-state.py over OBS WS. The
142 KB JSON, ffprobe walk, and ETag-cached route were all producing
one integer that MPD itself already knows.

RigData::playlistCount() now shells `mpc stats` and parses "Songs: N",
returning 0 on any failure (treated by callers as empty library).
Removes RigPlaylistCommand, DataController::playlist(), the
/data/playlist.js route, the per-overlay <script src> + window.__PLAYLIST
shims, and the stale storage/data/playlist.json artifact.

AudioController still consumes config('rig.music_dirs') for the HTTP
audio stream — that's orthogonal and stays.

webapp/app/Console/Commands/RigPlaylistCommand.php

@@ -1,125 +0,0 @@
-<?php
-
-namespace App\Console\Commands;
-
-use Illuminate\Console\Command;
-use Symfony\Component\Finder\Finder;
-use Symfony\Component\Process\Process;
-use Throwable;
-
-class RigPlaylistCommand extends Command
-{
-    protected $signature = 'rig:playlist';
-    protected $description = 'Index audio under the configured music roots → storage/data/playlist.json';
-
-    private const EXTS = ['m4a', 'mp3', 'opus', 'ogg', 'flac', 'webm', 'aac', 'wav'];
-
-    public function handle(): int
-    {
-        $roots = array_values(array_filter((array) config('rig.music_dirs')));
-        if (empty($roots)) {
-            $this->warn('  ! no music dirs configured (set MUSIC_DIR_1 in .env)');
-        }
-
-        $ffprobe = (string) config('rig.ffprobe', '/usr/bin/ffprobe');
-        if (!is_executable($ffprobe)) {
-            $this->error("  ✗ ffprobe not found at {$ffprobe} (install ffmpeg or set FFPROBE_BIN)");
-            return self::FAILURE;
-        }
-
-        $this->line('── Indexing audio roots ──');
-        foreach ($roots as $r) {
-            $this->line(is_dir($r) ? "    + {$r}" : "    ! {$r} (missing — skipped)");
-        }
-
-        $tracks = [];
-        foreach ($roots as $root) {
-            if (!is_dir($root)) continue;
-            $finder = (new Finder())
-                ->files()
-                ->in($root)
-                ->name('/\.(' . implode('|', self::EXTS) . ')$/i')
-                ->ignoreUnreadableDirs()
-                ->sortByName();
-
-            foreach ($finder as $file) {
-                $name = $file->getFilename();
-                $base = $file->getFilenameWithoutExtension();
-                // Skip yt-dlp intermediates (e.g. foo.f140.m4a, foo.temp.opus).
-                if (preg_match('/\.(?:f\d+|temp|part)$/i', $base)) continue;
-
-                $path = $file->getRealPath();
-                $meta = $this->probe($ffprobe, $path);
-                $tracks[] = [
-                    'title'       => $this->cleanTitle($base),
-                    'file'        => 'file://' . $this->urlEncodePath($path),
-                    'durationSec' => isset($meta['durationSec']) ? (int) $meta['durationSec'] : null,
-                ];
-            }
-        }
-
-        $doc = [
-            'syncedAt'   => gmdate('Y-m-d\TH:i:s\Z'),
-            'sourceDirs' => $roots,
-            'trackCount' => count($tracks),
-            'tracks'     => $tracks,
-        ];
-        $path = rtrim(config('rig.storage_data'), '/') . '/playlist.json';
-        @mkdir(dirname($path), 0775, true);
-        file_put_contents(
-            $path,
-            json_encode($doc, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE)
-        );
-
-        $this->line('');
-        $this->info("  ✓ wrote {$path} ({$doc['trackCount']} tracks)");
-        $this->line('  → refresh the Music Daemon browser source in OBS to reload the queue.');
-        return self::SUCCESS;
-    }
-
-    private function probe(string $ffprobe, string $path): array
-    {
-        try {
-            $proc = new Process([
-                $ffprobe, '-v', 'error',
-                '-show_entries', 'format=duration:format_tags=title,artist',
-                '-of', 'json',
-                $path,
-            ]);
-            $proc->setTimeout(10);
-            $proc->run();
-            if (!$proc->isSuccessful()) return [];
-            $json = json_decode($proc->getOutput(), true) ?: [];
-            $fmt = $json['format'] ?? [];
-            return [
-                'durationSec' => isset($fmt['duration']) ? (float) $fmt['duration'] : null,
-            ];
-        } catch (Throwable) {
-            return [];
-        }
-    }
-
-    /**
-     * Mirrors scripts/playlist.sh's clean_title():
-     *  - drop "| ..." (or fullwidth ｜) tails (genre/label noise)
-     *  - strip trailing YouTube IDs in brackets like "[-XxZTgMWKV0]"
-     *  - strip "[NCS Release]" / "(NCS10 Release)" suffixes
-     */
-    private function cleanTitle(string $t): string
-    {
-        $t = preg_replace('/\s*[｜|].*$/u', '', $t) ?? $t;
-        $t = preg_replace('/\s*\[[A-Za-z0-9_-]{11}\]\s*$/', '', $t) ?? $t;
-        $t = preg_replace(
-            '/\s*[\[(](?:NCS\d*|No Copyright Sounds)(?:\s+Release)?[\])]\s*$/i',
-            '',
-            $t
-        ) ?? $t;
-        return trim($t);
-    }
-
-    private function urlEncodePath(string $path): string
-    {
-        // Same as Python's urllib.parse.quote(..., safe='/') — keep separators, encode the rest.
-        return implode('/', array_map('rawurlencode', explode('/', $path)));
-    }
-}