storage: per-camera target + date subfolders; move active-storage widget

- Camera.storage_id: each camera chooses its storage ("" = active/default).
  supervisor resolves per-camera (storage_by_id → active fallback); cameras
  API (body/payload) + /toggle accept storage_id and repoint the recorder.
- Recordings now go to <root>/<cam>/<YYYY-MM-DD>/<file>.mp4. This ffmpeg build
  lacks -strftime_mkdir, so recorder_task pre-creates today+tomorrow dirs at
  start and the indexer re-ensures them each tick (survives midnight).
- indexer: scan date subdirs + legacy flat files; sort by basename so the
  in-progress segment is detected correctly when both layouts coexist.
- frontend: per-camera "Хранилище" dropdown in the camera table (inline) and
  in the add/edit + bulk forms. Move the active-storage summary widget from
  the Система tab into the Хранилища tab.

VERSION 0.0.129.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/settings.html

@@ -56,7 +56,7 @@
           </div>
           <table class="cams">
             <thead>
-              <tr><th style="width:48px">ID</th><th>Камера</th><th>IP</th><th>Потоки</th><th style="width:56px">Вкл</th><th style="width:64px">Запись</th><th>Статус</th><th></th></tr>
+              <tr><th style="width:48px">ID</th><th>Камера</th><th>IP</th><th>Потоки</th><th style="width:56px">Вкл</th><th style="width:64px">Запись</th><th style="width:150px">Хранилище</th><th>Статус</th><th></th></tr>
             </thead>
             <tbody id="cam-rows"></tbody>
           </table>
@@ -140,16 +140,16 @@
           <div style="margin-top:12px"><button id="pol-save">Сохранить</button></div>
           <div class="muted" id="pol-saved" style="margin-top:8px;font-size:12px"></div>
         </div>
+
+        <div class="card">
+          <h2>Активное хранилище <span class="muted" style="font-weight:400;font-size:12px">— сводка</span></h2>
+          <div class="kv" id="storage-kv"><div class="muted">загрузка…</div></div>
+        </div>
       </div>
 
       <!-- ВКЛАДКА 2: Система -->
       <div class="tab-panel" data-panel="general" data-min-role="operator" hidden>
         <div class="wrap">
-          <div class="card">
-            <h2>Хранилище <span class="muted" style="font-weight:400;font-size:12px">— активное (управление во вкладке «Хранилища»)</span></h2>
-            <div class="kv" id="storage-kv"><div class="muted">загрузка…</div></div>
-          </div>
-
           <div class="card">
             <h2>Система</h2>
             <div class="kv" id="system-kv"><div class="muted">загрузка…</div></div>