feat: implement Phase 2 Core features for AutoScheduler GTD System

- ConnectWise Manage Integration:
  - ConnectWiseModule with service, controller, entity
  - API endpoints for connection CRUD and sync
  - Syncs service tickets, project tickets, zero-ticket projects
  - Stores ConnectWise priority/SLA in task metadata

- Intelligent Calendar Scheduling:
  - CalendarModule with connection and event entities
  - Support for CalDAV, Microsoft Graph, Google Calendar providers
  - CalendarService with sync methods for all providers
  - SchedulingModule with automatic scheduling engine
  - Finds available slots respecting working hours
  - Groups tasks by context, respects priority and due dates

- Interactive Calendar Week View:
  - FullCalendar with timeGridWeek view
  - Drag-and-drop task rescheduling
  - Tasks auto-lock when manually moved
  - Color-coded by context
  - Regenerate Schedule button

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/backend/src/modules/calendar/entities/calendar-event.entity.ts

@@ -0,0 +1,59 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  UpdateDateColumn,
+  ManyToOne,
+  JoinColumn,
+} from 'typeorm';
+import { User } from '../../users/entities/user.entity';
+import { CalendarConnection } from './calendar-connection.entity';
+import { CalendarProvider } from '@nick-tracker/shared-types';
+
+@Entity('calendar_events')
+export class CalendarEvent {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  externalId: string;
+
+  @Column()
+  title: string;
+
+  @Column({ type: 'timestamp' })
+  startTime: Date;
+
+  @Column({ type: 'timestamp' })
+  endTime: Date;
+
+  @Column({ default: false })
+  isAllDay: boolean;
+
+  @Column({
+    type: 'enum',
+    enum: CalendarProvider,
+  })
+  source: CalendarProvider;
+
+  @Column({ type: 'uuid' })
+  userId: string;
+
+  @ManyToOne(() => User, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'userId' })
+  user: User;
+
+  @Column({ type: 'uuid', nullable: true })
+  connectionId: string | null;
+
+  @ManyToOne(() => CalendarConnection, { onDelete: 'SET NULL' })
+  @JoinColumn({ name: 'connectionId' })
+  connection: CalendarConnection | null;
+
+  @CreateDateColumn()
+  createdAt: Date;
+
+  @UpdateDateColumn()
+  updatedAt: Date;
+}