Make the filter limit a restart setting with 0 for no limit

Lowering the limit at runtime would leave connections holding more
filters than allowed, so read it once when the controller starts.
Move the limit tests into the subscribe and replace groups.

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

packages/controller/src/Controller.ts

@@ -83,7 +83,7 @@ export default class Controller {
 	private _events = new events.EventEmitter<ControllerEvents>();
 
 	/** Event subscription controller */
-	subscriptions = new lib.SubscriptionController(() => this.config.get("controller.max_subscription_filters"));
+	subscriptions: lib.SubscriptionController;
 	/** User manager for the cluster, also contains access to the user records */
 	users: UserManager;
 	/** Instance manager for the cluster, also contains access to the user records */
@@ -273,6 +273,7 @@ export default class Controller {
 		});
 
 		// Handle subscriptions for all internal properties
+		this.subscriptions = new lib.SubscriptionController(config.get("controller.max_subscription_filters"));
 		this.subscriptions.handle(lib.SystemInfoUpdateEvent, this.handleSystemInfoSubscription.bind(this));
 		this.subscriptions.handle(lib.HostUpdatesEvent, this.handleHostSubscription.bind(this));
 		this.subscriptions.handle(lib.InstanceDetailsUpdatesEvent, this.handleInstanceDetailsSubscription.bind(this));