feat: add live replays and PostgreSQL maintenance tools

- Stream compact live replay updates across local and clustered dashboards.
- Render responsive snake bodies as SVG paths with aligned custom icons.
- Add cache-busted assets, replay fallback routes, and live-follow playback.
- Support PostgreSQL benchmark sampling and idempotent SQLite migration.
- Add dry-run cleanup for old low-quality PostgreSQL replay payloads.
- Reward safe perimeter lanes and bump Prism to version 1.5.0.
- Add backend, migration, dashboard, and perimeter regression coverage.

templates/files/js/DashboardWebSocket.js

@@ -1,11 +1,12 @@
 class DashboardWebSocket {
-  constructor({ onGamesUpdate, onShutdown } = {}) {
+  constructor({ onGamesUpdate, onReplayUpdate, onShutdown } = {}) {
     this._socket = null;
     this._reconnectTimer = null;
     this._shuttingDown = false;
     this._pendingRequests = new Map();
     this._requestSeq = 0;
     this._onGamesUpdate = onGamesUpdate || (() => {});
+    this._onReplayUpdate = onReplayUpdate || (() => {});
     this._onShutdown = onShutdown || (() => {});
   }
 
@@ -58,6 +59,11 @@ class DashboardWebSocket {
         return;
       }
 
+      if (payload.type === "dashboard_game_replay_update") {
+        this._onReplayUpdate(payload);
+        return;
+      }
+
       if (payload.type === "dashboard_games_update") {
         this._onGamesUpdate(payload);
       }