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/frontend/package.json

@@ -13,6 +13,11 @@
     "clean": "rm -rf dist"
   },
   "dependencies": {
+    "@fullcalendar/core": "^6.1.20",
+    "@fullcalendar/daygrid": "^6.1.20",
+    "@fullcalendar/interaction": "^6.1.20",
+    "@fullcalendar/react": "^6.1.20",
+    "@fullcalendar/timegrid": "^6.1.20",
     "@nick-tracker/shared-types": "*",
     "@radix-ui/react-dialog": "^1.0.5",
     "@radix-ui/react-dropdown-menu": "^2.0.6",