feat: label AI-rescheduled appointments and add manual confirm option

- Add movedByAi boolean column to Appointment table (default false)
- reschedule-graph: set movedByAi=true when AI moves an appointment
- PATCH /api/appointments/:id/confirm endpoint clears the movedByAi flag
- Schedule grid: show teal AI badge on appointment cards where movedByAi=true
- Right-click context menu: 'Manually Confirmed' removes the AI badge via the confirm endpoint

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

packages/db/generated/prisma/index-browser.js

@@ -165,6 +165,7 @@ exports.Prisma.AppointmentScalarFieldEnum = {
   notes: 'notes',
   procedureCodeNotes: 'procedureCodeNotes',
   status: 'status',
+  movedByAi: 'movedByAi',
   createdAt: 'createdAt',
   eligibilityStatus: 'eligibilityStatus'
 };