feat(portals): make connection cooldown configurable in desktop settings (#1536)

libs/shared/interfaces/src/lib/settings.interface.ts

@@ -229,6 +229,8 @@ export interface Settings {
      * Captured per session, so a change applies to the next session.
      */
     embeddedMpvAutoReconnect?: boolean;
+    /** Desktop Xtream/Stalker request cooldown. Default on; applies on Save. */
+    portalConnectivityGuard?: boolean;
     /** Cover/poster sizing preset applied across grids and rails */
     coverSize?: CoverSize;
     /** Live EPG panel layout: horizontal timeline (default) or vertical list */