v1.6.5: fix attendance unique constraint, schema sync, seed script

- Change attendance idx_attendance_user_date from unique to index (allow multiple shifts per day)
- Reset migrations to single baseline init migration
- Add seed script with admin user (admin/admin)
- Update CLAUDE.md with migration workflow documentation
- Various frontend fixes (queries, pages, hooks)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/admin/pages/Trips.tsx

@@ -13,32 +13,16 @@ import Forbidden from "../components/Forbidden";
 import { formatDate } from "../utils/attendanceHelpers";
 import { formatKm } from "../utils/formatters";
 import apiFetch from "../utils/api";
-import { tripListOptions, tripVehiclesOptions } from "../lib/queries/trips";
+import {
+  tripListOptions,
+  tripVehiclesOptions,
+  type BackendTrip,
+  type TripVehicle,
+} from "../lib/queries/trips";
 import { Skeleton } from "boneyard-js/react";
 import TripsFixture from "../fixtures/TripsFixture";
 const API_BASE = "/api/admin";
 
-interface Vehicle {
-  id: number | string;
-  spz: string;
-  name: string;
-}
-
-interface Trip {
-  id: number;
-  vehicle_id: number | string;
-  trip_date: string;
-  start_km: number;
-  end_km: number;
-  distance?: number | null;
-  route_from: string;
-  route_to: string;
-  is_business: boolean;
-  notes?: string | null;
-  users?: { id: number; first_name: string; last_name: string };
-  vehicles?: { id: number; name: string; spz: string };
-}
-
 interface TripForm {
   vehicle_id: string;
   trip_date: string;
@@ -60,15 +44,12 @@ export default function Trips() {
   );
   const { data: vehiclesData } = useQuery(tripVehiclesOptions());
 
-  const trips = (tripsData ?? []) as Record<string, unknown>[] as Trip[];
-  const vehicles = (vehiclesData ?? []) as Record<
-    string,
-    unknown
-  >[] as Vehicle[];
+  const trips = tripsData ?? [];
+  const vehicles = vehiclesData ?? [];
 
   const [submitting, setSubmitting] = useState(false);
   const [showModal, setShowModal] = useState(false);
-  const [editingTrip, setEditingTrip] = useState<Trip | null>(null);
+  const [editingTrip, setEditingTrip] = useState<BackendTrip | null>(null);
   const [deleteConfirm, setDeleteConfirm] = useState<{
     show: boolean;
     tripId: number | null;
@@ -130,7 +111,7 @@ export default function Trips() {
     setShowModal(true);
   };
 
-  const openEditModal = (trip: Trip) => {
+  const openEditModal = (trip: BackendTrip) => {
     setEditingTrip(trip);
     setForm({
       vehicle_id: String(trip.vehicle_id),