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/AttendanceBalances.tsx

@@ -11,6 +11,13 @@ import {
   attendanceBalancesOptions,
   attendanceWorkFundOptions,
   attendanceProjectReportOptions,
+  type BalanceEntry,
+  type BalancesData,
+  type FundData,
+  type FundUserData,
+  type MonthFundData,
+  type ProjectData,
+  type UserShort,
 } from "../lib/queries/attendance";
 
 import apiFetch from "../utils/api";
@@ -18,70 +25,6 @@ import { Skeleton } from "boneyard-js/react";
 import AttendanceBalancesFixture from "../fixtures/AttendanceBalancesFixture";
 const API_BASE = "/api/admin";
 
-interface BalanceEntry {
-  name: string;
-  vacation_total: number;
-  vacation_used: number;
-  vacation_remaining: number;
-  sick_used: number;
-}
-
-interface UserShort {
-  id: number | string;
-  name: string;
-}
-
-interface FundUserData {
-  name: string;
-  worked: number;
-  covered: number;
-  overtime: number;
-  missing: number;
-}
-
-interface MonthFundData {
-  month_name: string;
-  fund: number;
-  fund_to_date: number;
-  business_days: number;
-  users?: Record<string, FundUserData>;
-}
-
-interface ProjectUser {
-  user_id: number;
-  user_name: string;
-  hours: number;
-}
-
-interface ProjectEntry {
-  project_id: number | null;
-  project_number?: string;
-  project_name?: string;
-  hours: number;
-  users: ProjectUser[];
-}
-
-interface MonthProjectData {
-  month_name: string;
-  projects: ProjectEntry[];
-}
-
-interface BalancesData {
-  users: UserShort[];
-  balances: Record<string, BalanceEntry>;
-}
-
-interface FundData {
-  months: Record<string, MonthFundData>;
-  holidays: unknown[];
-  users: UserShort[];
-  balances: Record<string, unknown>;
-}
-
-interface ProjectData {
-  months: Record<string, MonthProjectData>;
-}
-
 const getVacationClass = (remaining: number): string => {
   if (remaining <= 0) return "text-danger";
   if (remaining < 20) return "text-warning";
@@ -144,18 +87,15 @@ export default function AttendanceBalances() {
   const { hasPermission } = useAuth();
   const queryClient = useQueryClient();
   const [year, setYear] = useState(new Date().getFullYear());
-  const { data: balancesRaw, isPending: balancesPending } = useQuery(
+  const { data: balancesData, isPending: balancesPending } = useQuery(
     attendanceBalancesOptions(year),
   );
-  const { data: fundRaw, isPending: fundPending } = useQuery(
+  const { data: fundData, isPending: fundPending } = useQuery(
     attendanceWorkFundOptions(year),
   );
-  const { data: projectRaw, isPending: projectPending } = useQuery(
+  const { data: projectData, isPending: projectPending } = useQuery(
     attendanceProjectReportOptions(year),
   );
-  const balancesData = balancesRaw as BalancesData | undefined;
-  const fundData = fundRaw as FundData | undefined;
-  const projectData = projectRaw as ProjectData | undefined;
 
   const [showEditModal, setShowEditModal] = useState(false);
   const [editingUser, setEditingUser] = useState<{