feat(framework): core EventBus(类型化+故障隔离)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

cocoscreator_projects/YouleNexus/assets/framework/core/events.ts

@@ -0,0 +1,29 @@
+type Handler = (...args: any[]) => void;
+
+/** 轻量类型化事件总线。订阅者抛错被隔离，不影响其它订阅者（故障隔离）。 */
+export class EventBus<Events extends Record<string, any[]> = Record<string, any[]>> {
+  private map = new Map<string, Set<Handler>>();
+
+  on<K extends keyof Events & string>(type: K, fn: (...args: Events[K]) => void): void {
+    let set = this.map.get(type);
+    if (!set) { set = new Set(); this.map.set(type, set); }
+    set.add(fn as Handler);
+  }
+
+  once<K extends keyof Events & string>(type: K, fn: (...args: Events[K]) => void): void {
+    const wrap = (...args: Events[K]) => { this.off(type, wrap as any); (fn as any)(...args); };
+    this.on(type, wrap as any);
+  }
+
+  off<K extends keyof Events & string>(type: K, fn: (...args: Events[K]) => void): void {
+    this.map.get(type)?.delete(fn as Handler);
+  }
+
+  emit<K extends keyof Events & string>(type: K, ...args: Events[K]): void {
+    const set = this.map.get(type);
+    if (!set) return;
+    for (const fn of [...set]) {
+      try { fn(...args); } catch (e) { console.error('[EventBus] handler error:', e); }
+    }
+  }
+}