refactor: migrate to monorepo structure with Docker, PocketBase, and e2e tests

- Reorganize into apps/, packages/, docs/, e2e/, pocketbase/ directories
- Add Dockerfiles for web, worker, and PocketBase services
- Add docker-compose.yml for local orchestration
- Add turbo.json for monorepo task management
- Add Playwright e2e test infrastructure
- Add PocketBase backend with migrations
- Remove Vite/Next.js/ESLint/PostCSS config files
- Update package.json with workspace dependencies
- Add .env.example and .dockerignore

apps/web/lib/events/event-bus.ts

@@ -0,0 +1,92 @@
+import { EventEmitter } from 'events';
+
+// Create a singleton event bus
+class EventBus extends EventEmitter {
+  constructor() {
+    super();
+    // Increase max listeners for high-traffic scenarios
+    this.setMaxListeners(100);
+  }
+}
+
+export const eventBus = new EventBus();
+
+// Event type definitions
+export interface TaskCompletedEvent {
+  taskId: string;
+  taskTitle: string;
+  projectId?: string;
+  domain: string;
+  userId: string;
+}
+
+export interface HabitCompletedEvent {
+  habitId: string;
+  habitTitle: string;
+  date: string;
+  domain: string;
+  userId: string;
+}
+
+export interface HabitStreakBrokenEvent {
+  habitId: string;
+  habitTitle: string;
+  previousStreak: number;
+  domain: string;
+  userId: string;
+}
+
+export interface MilestoneReachedEvent {
+  milestoneId: string;
+  milestoneTitle: string;
+  projectId: string;
+  domain: string;
+  userId: string;
+}
+
+export interface ProjectStatusChangedEvent {
+  projectId: string;
+  projectTitle: string;
+  oldStatus: string;
+  newStatus: string;
+  domain: string;
+  userId: string;
+}
+
+export interface ReportGeneratedEvent {
+  reportId: string;
+  reportTitle: string;
+  reportType: string;
+  domain: string;
+  userId: string;
+}
+
+export interface AgentTaskCompletedEvent {
+  agentTaskId: string;
+  agentId: string;
+  entityType: string;
+  entityId: string;
+  userId: string;
+}
+
+// Event names as constants
+export const EVENTS = {
+  TASK_COMPLETED: 'task.completed',
+  HABIT_COMPLETED: 'habit.completed',
+  HABIT_STREAK_BROKEN: 'habit.streak_broken',
+  MILESTONE_REACHED: 'milestone.reached',
+  PROJECT_STATUS_CHANGED: 'project.status_changed',
+  REPORT_GENERATED: 'report.generated',
+  AGENT_TASK_COMPLETED: 'agent_task.completed',
+} as const;
+
+// Type-safe emit helper
+export function emitEvent<T>(event: string, data: T): void {
+  eventBus.emit(event, data);
+}
+
+// Type-safe listener helper
+export function onEvent<T>(event: string, handler: (data: T) => void): () => void {
+  eventBus.on(event, handler);
+  return () => eventBus.off(event, handler);
+}