feat: implement domain guard for commission calculation and enhance representation dashboard

- Added domain guard in CommissionService to ensure commission is calculated only when the appointment is booked under the same representation as the doctor.
- Updated RepresentationController to filter statistics by representation, ensuring accurate data is shown for each representative.
- Introduced new endpoints for the representation dashboard to provide summary statistics, doctor performance, and financial reports.
- Created new pages for RepresentationFinance and RepresentationSettlement to display financial data and allow for settlement requests.
- Added migration to include booking_representation_id in appointments for tracking the representative under which the appointment was booked.

assets/admin/styles.css

@@ -450,6 +450,13 @@ body {
 .badge.violet { color: var(--violet);  background: var(--violet-bg); }
 .badge.gray   { color: var(--text-2);  background: var(--surface-3); }
 
+/* ── Simple data table (rep dashboard/finance/settlement) ────── */
+.tbl { border-collapse: collapse; font-size: 13px; }
+.tbl thead tr { border-bottom: 1px solid var(--border); }
+.tbl th { text-align: right; padding: 8px 12px; color: var(--text-3); font-weight: 500; white-space: nowrap; }
+.tbl td { padding: 8px 12px; border-bottom: 1px solid var(--border); }
+.tbl tbody tr:last-child td { border-bottom: none; }
+
 /* ── Appointment status badges ───────────────────────────────── */
 .appt-status {
   display: inline-flex; align-items: center; gap: 6px;