refactor(events): broadcast team events to an explicit team

Move the shared team id and team channel logic of 15 broadcast events
into a BroadcastsToTeam trait. Events no longer fall back to the session
team: the session team can differ from the resource team, and queued
jobs have no session.

Fix StopDatabaseProxy, which dispatched DatabaseProxyStopped without a
team, so the event was never broadcast from queued jobs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/Http/Controllers/Controller.php

@@ -33,7 +33,7 @@ class Controller extends BaseController
         if (auth()->user()?->currentTeam()->id !== 0) {
             return redirect(RouteServiceProvider::HOME);
         }
-        TestEvent::dispatch();
+        TestEvent::dispatch(currentTeam()->id);
 
         return 'Look at your other tab.';
     }