chore: release v1.0.7

Playout: slate fallback, strict ffprobe validation, Prometheus metrics
Chat: history on join, DM offline delivery, env-config rate limits,
  Redis auto-reconnect, heartbeat, ban/mute enforcement, DM metrics
Viewer: presence indicators, schedule overlay, public /api/schedule
Admin: playlist drag-reorder, schedule overrides CRUD, user actions,
  inline mod buttons, CSV export, config editor, restart buttons,
  upload normalization gate, analytics time range
nginx: CORS preflight, JSON health, stub_status
Docs: test-lab vs production distinction across all configs/docs
Infra: Redis maxmemory, CD health IP-agnostic, slate volume mount

frontend/public/admin/playlist.html

@@ -1,7 +1,7 @@
 <div class="panel-header-row">
     <div>
         <h1>Playlist</h1>
-        <p>Edit the active concat playlist used by the playout service.</p>
+        <p>Edit the active concat playlist. Drag entries to reorder.</p>
     </div>
     <div class="button-row">
         <button id="reload-playlist-btn" type="button" class="btn btn-secondary">Reload</button>
@@ -10,7 +10,9 @@
 </div>
 
 <div class="panel-card">
-    <label for="playlist-content" class="sr-only">Playlist content</label>
-    <textarea id="playlist-content" class="text-input text-area" spellcheck="false"></textarea>
+    <div id="playlist-warnings" class="status-warnings" hidden></div>
+    <ul id="playlist-sortable" class="sortable-list" aria-label="Playlist entries"></ul>
+    <label for="playlist-content" class="sr-only">Playlist content (raw)</label>
+    <textarea id="playlist-content" class="text-input text-area" spellcheck="false" rows="6"></textarea>
     <p id="playlist-status" class="status-line" aria-live="polite">Loading playlist...</p>
 </div>