Add per-disk profiles with video transcoding support

Each disk stores .jukebox/profile.json with copy parameters (dest
folder, overwrite mode, file select, reserve space, auto-copy) and
optional transcoding limits for the target player (codec, resolution,
bitrate, FPS, audio channels, output format).

On copy, video files are probed with ffprobe; if they exceed the
profile limits they are transcoded via ffmpeg (-threads 0 for full
CPU usage), otherwise copied as-is. Scale filter never upscales.

New: internal/disk/profile.go, internal/transcoder/{detect,transcoder}.go
API: GET/PUT /api/disks/profile?mount_path=
UI: disk profile panel in dashboard for known disks
Dockerfile: adds ffmpeg to the runtime image

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/templates/dashboard.html

@@ -137,9 +137,147 @@ function renderDisk() {
         ` : ''}
       </div>
     </section>
+    ${isKnown ? renderProfile(disk) : ''}
   `;
 }
 
+function renderProfile(disk) {
+  const p = disk.profile || {};
+  const t = p.transcode || null;
+  const transcodeEnabled = !!t;
+
+  const sel = (name, value, options) => {
+    const opts = options.map(([v, label]) =>
+      `<option value="${v}" ${v === value ? 'selected' : ''}>${escapeHTML(label)}</option>`
+    ).join('');
+    return `<select class="form-input" id="prof_${name}">${opts}</select>`;
+  };
+
+  const transcodeSection = `
+    <div id="transcodeFields" style="${transcodeEnabled ? '' : 'display:none'}">
+      <div class="form-group">
+        <label>Видеокодек</label>
+        ${sel('video_codec', t?.video_codec || 'h264', [['h264','H.264 (AVC)'],['h265','H.265 (HEVC)'],['mpeg4','MPEG-4']])}
+      </div>
+      <div class="form-group">
+        <label>Макс. разрешение</label>
+        ${sel('max_resolution', t?.max_resolution || '720p', [['480p','480p'],['720p','720p (HD)'],['1080p','1080p (Full HD)']])}
+      </div>
+      <div class="form-group">
+        <label>Макс. битрейт видео</label>
+        ${sel('max_video_bitrate', t?.max_video_bitrate || '2000k', [['','Без лимита'],['1000k','1000 кбит/с'],['2000k','2000 кбит/с'],['4000k','4000 кбит/с'],['8000k','8000 кбит/с']])}
+      </div>
+      <div class="form-group">
+        <label>Макс. FPS</label>
+        ${sel('max_fps', String(t?.max_fps ?? 0), [['0','Без лимита'],['24','24'],['25','25'],['30','30']])}
+      </div>
+      <hr>
+      <div class="form-group">
+        <label>Аудиокодек</label>
+        ${sel('audio_codec', t?.audio_codec || 'aac', [['aac','AAC'],['mp3','MP3']])}
+      </div>
+      <div class="form-group">
+        <label>Макс. битрейт аудио</label>
+        ${sel('max_audio_bitrate', t?.max_audio_bitrate || '192k', [['','Без лимита'],['128k','128 кбит/с'],['192k','192 кбит/с'],['320k','320 кбит/с']])}
+      </div>
+      <div class="form-group">
+        <label>Каналы</label>
+        ${sel('max_audio_channels', String(t?.max_audio_channels ?? 0), [['0','Копировать'],['2','Стерео (2.0)'],['6','5.1']])}
+      </div>
+      <hr>
+      <div class="form-group">
+        <label>Формат контейнера</label>
+        ${sel('output_format', t?.output_format || 'mp4', [['mp4','MP4'],['mkv','MKV'],['avi','AVI']])}
+      </div>
+    </div>
+  `;
+
+  return `
+    <section class="panel" id="profilePanel">
+      <h2>Профиль диска</h2>
+      <div class="panel-body">
+        <h3>Параметры копирования</h3>
+        <div class="form-group">
+          <label>Папка назначения</label>
+          <input class="form-input" type="text" id="prof_dest_folder" value="${escapeHTML(p.dest_folder || 'media')}">
+        </div>
+        <div class="form-group">
+          <label>Режим перезаписи</label>
+          ${sel('overwrite_mode', p.overwrite_mode || 'skip', [['skip','Пропускать существующие'],['delete','Заменять всё']])}
+        </div>
+        <div class="form-group">
+          <label>Выбор файлов</label>
+          ${sel('file_select_mode', p.file_select_mode || 'new', [['new','Только новые'],['all','Все подходящие']])}
+        </div>
+        <div class="form-group">
+          <label>Резерв свободного места (ГБ)</label>
+          <input class="form-input" type="number" id="prof_reserve_free_gb" value="${p.reserve_free_gb ?? 2}" min="0" step="0.5">
+        </div>
+        <div class="form-group">
+          <label><input type="checkbox" id="prof_auto_copy" ${p.auto_copy ? 'checked' : ''}> Автокопирование при подключении</label>
+        </div>
+
+        <h3 style="margin-top:1.5em">Транскодирование видео</h3>
+        <div class="form-group">
+          <label>
+            <input type="checkbox" id="prof_transcode_enabled" ${transcodeEnabled ? 'checked' : ''}
+              onchange="document.getElementById('transcodeFields').style.display=this.checked?'':'none'">
+            Ограничить видео под устройство
+          </label>
+        </div>
+        ${transcodeSection}
+
+        <div class="btn-row" style="margin-top:1em">
+          <button class="button-primary" onclick="saveProfile('${escapeHTML(disk.mount_path)}')">Сохранить профиль</button>
+        </div>
+      </div>
+    </section>
+  `;
+}
+
+async function saveProfile(mountPath) {
+  const g = id => document.getElementById(id);
+  const transcodeEnabled = g('prof_transcode_enabled')?.checked;
+
+  const profile = {
+    dest_folder:      g('prof_dest_folder')?.value.trim() || 'media',
+    overwrite_mode:   g('prof_overwrite_mode')?.value || 'skip',
+    file_select_mode: g('prof_file_select_mode')?.value || 'new',
+    reserve_free_gb:  parseFloat(g('prof_reserve_free_gb')?.value || '2') || 0,
+    auto_copy:        g('prof_auto_copy')?.checked || false,
+  };
+
+  if (transcodeEnabled) {
+    profile.transcode = {
+      video_codec:        g('prof_video_codec')?.value || 'h264',
+      max_resolution:     g('prof_max_resolution')?.value || '720p',
+      max_video_bitrate:  g('prof_max_video_bitrate')?.value || '',
+      max_fps:            parseInt(g('prof_max_fps')?.value || '0', 10),
+      audio_codec:        g('prof_audio_codec')?.value || 'aac',
+      max_audio_bitrate:  g('prof_max_audio_bitrate')?.value || '',
+      max_audio_channels: parseInt(g('prof_max_audio_channels')?.value || '0', 10),
+      output_format:      g('prof_output_format')?.value || 'mp4',
+    };
+  }
+
+  try {
+    const response = await fetch('/api/disks/profile?mount_path=' + encodeURIComponent(mountPath), {
+      method: 'PUT',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(profile)
+    });
+    const payload = await response.json();
+    if (!response.ok) {
+      toast(payload.error || 'Ошибка сохранения профиля', 'error');
+      return;
+    }
+    toast('Профиль сохранён', 'ok');
+    refreshSelectedDisk();
+  } catch (error) {
+    toast('Ошибка сети', 'error');
+  }
+}
+
 function stopTaskPoll(taskID) {
   if (!taskPollers.has(taskID)) return;
   clearInterval(taskPollers.get(taskID));