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/package.json

@@ -20,6 +20,7 @@
     "migration:revert": "typeorm migration:revert -d src/config/typeorm.config.ts"
   },
   "dependencies": {
+    "@microsoft/microsoft-graph-client": "^3.0.7",
     "@nestjs/common": "^10.3.0",
     "@nestjs/config": "^3.1.1",
     "@nestjs/core": "^10.3.0",
@@ -31,12 +32,14 @@
     "@nestjs/typeorm": "^10.0.1",
     "@nestjs/websockets": "^10.3.0",
     "@nick-tracker/shared-types": "*",
+    "axios": "^1.13.2",
     "bcrypt": "^5.1.1",
     "bull": "^4.12.0",
     "class-transformer": "^0.5.1",
     "class-validator": "^0.14.0",
     "date-fns": "^3.2.0",
     "helmet": "^7.1.0",
+    "ical.js": "^2.2.1",
     "ioredis": "^5.3.2",
     "passport": "^0.7.0",
     "passport-jwt": "^4.0.1",