feat: add customer-facing appointment notes (GRO-106)

- Migration 0014: add customer_notes column to appointments
- Schema update: add customerNotes field to appointments table
- Factory update: include customerNotes in buildAppointment
- Portal route: PATCH /api/portal/appointments/:id/notes
  - Ownership validation via impersonation session
  - Future-only validation (no edits after start)
  - 500 character limit
- Register portal router in index.ts

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/index.ts

@@ -111,6 +111,7 @@ api.route("/clients", clientsRouter);
 api.route("/pets", petsRouter);
 api.route("/services", servicesRouter);
 api.route("/appointments", appointmentsRouter);
+api.route("/portal", portalRouter);
 api.route("/staff", staffRouter);
 api.route("/invoices", invoicesRouter);
 api.route("/reports", reportsRouter);

apps/api/src/routes/portal.ts

@@ -64,7 +64,7 @@ portalRouter.patch(
       .where(eq(appointments.id, id))
       .returning();
 
-    if (!updated) {
+if (!updated) {
       return c.json({ error: "Not found" }, 404);
     }