fix: security, validation, and data integrity fixes across 53 files

- Auth: HS256 algorithm restriction on JWT verify, timing-safe bcrypt
  for inactive/locked users, locked_until check in loadAuthData, TOTP
  fixes (async bcrypt, BigInt conversion, future-code counter fix)
- Validation: Zod enums for leave_type/status, numeric transforms on
  foreign keys, VAT 0% coercion fix (Number(v)||21 → v!=null checks)
- Permissions: requirePermission on attendance PUT, attendance_users
  and project_logs access checks, trips users filtered by trips.record
- Prisma queries: fixed roles.is:{OR} pattern (doesn't work on to-one
  relations), attendance_users now filters by attendance.record only
- Transactions: wrapped deleteOrder, createOrder, updateUser, deleteUser,
  duplicateOffer, bulkCreateAttendance, createLeave, scope-templates,
  leave-requests, company-settings, profile updates
- Frontend: mountedRef reset in useListData, blob URL cleanup on unmount,
  null checks on date fields, AdminDatePicker min/max for HH:mm
- Security headers: COOP, CORP, CSP frame-ancestors/form-action/base-uri
- Other: exchange-rate cache TTL, invoice-alert midnight comparison fix,
  numbering.service releaseSequence no-op, nas-offers filename sanitize,
  Content-Disposition header injection fix, mojibake Czech strings

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

src/routes/admin/vehicles.ts

@@ -131,6 +131,18 @@ export default async function vehiclesRoutes(
       const existing = await prisma.vehicles.findUnique({ where: { id } });
       if (!existing) return error(reply, "Vozidlo nenalezeno", 404);
 
+      // Check for linked trips before deleting
+      const tripCount = await prisma.trips.count({
+        where: { vehicle_id: id },
+      });
+      if (tripCount > 0) {
+        return error(
+          reply,
+          "Vozidlo má přiřazené jízdy a nelze jej smazat",
+          409,
+        );
+      }
+
       await prisma.vehicles.delete({ where: { id } });
       await logAudit({
         request,