refactor: complete code efficiency pass (Issues #10, #14, #16)

Backend:
- Add Prisma soft-delete middleware for automatic deletedAt filtering (#10)
- Split 2758-line copilot.service.ts into focused sub-services (#14):
  - copilot-schedule.service.ts (schedule/event tools)
  - copilot-reports.service.ts (reporting/analytics tools)
  - copilot-fleet.service.ts (vehicle/driver tools)
  - copilot-vip.service.ts (VIP management tools)
  - copilot.service.ts now thin orchestrator
- Remove manual deletedAt: null from 50+ queries

Frontend:
- Create SortableHeader component for reusable table sorting (#16)
- Create useListPage hook for shared search/filter/sort state (#16)
- Update VipList, DriverList, EventList to use shared infrastructure

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/src/gps/gps.service.ts

@@ -375,9 +375,6 @@ Note: GPS tracking is only active during shift hours (${settings.shiftStartHour}
     const devices = await this.prisma.gpsDevice.findMany({
       where: {
         isActive: true,
-        driver: {
-          deletedAt: null,
-        },
       },
       include: {
         driver: {
@@ -743,7 +740,6 @@ Note: GPS tracking is only active during shift hours (${settings.shiftStartHour}
       where: {
         role: 'ADMINISTRATOR',
         isApproved: true,
-        deletedAt: null,
       },
     });