GET /api/dashboard returns aggregated data:
- deadline_summary: overdue, due this/next week, ok counts
- case_summary: active, new this month, closed counts
- upcoming_deadlines: next 7 days with case info
- upcoming_appointments: next 7 days
- recent_activity: last 10 case events
Uses efficient CTE query for summaries. Also fixes duplicate
writeJSON/writeError declarations in appointments handler.
- AppointmentService with tenant-scoped List, GetByID, Create, Update, Delete
- List supports filtering by case_id, appointment_type, and date range (start_from/start_to)
- AppointmentHandler with JSON request/response handling and input validation
- Router wired up: GET/POST /api/appointments, PUT/DELETE /api/appointments/{id}
