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/AttendanceCreate.tsx

@@ -1,5 +1,5 @@
 import { useState } from "react";
-import { useQuery } from "@tanstack/react-query";
+import { useQuery, useQueryClient } from "@tanstack/react-query";
 import { userListOptions } from "../lib/queries/users";
 import { useAlert } from "../context/AlertContext";
 import { useAuth } from "../context/AuthContext";
@@ -14,11 +14,6 @@ import { Skeleton } from "boneyard-js/react";
 import AttendanceCreateFixture from "../fixtures/AttendanceCreateFixture";
 const API_BASE = "/api/admin";
 
-interface User {
-  id: number | string;
-  name: string;
-}
-
 interface CreateForm {
   user_id: string;
   shift_date: string;
@@ -39,8 +34,12 @@ export default function AttendanceCreate() {
   const alert = useAlert();
   const { hasPermission } = useAuth();
   const navigate = useNavigate();
+  const queryClient = useQueryClient();
   const { data: usersData, isPending: loading } = useQuery(userListOptions());
-  const users = (usersData as unknown as User[] | undefined) ?? [];
+  const users = (usersData ?? []).map((u) => ({
+    id: u.id,
+    name: `${u.first_name} ${u.last_name}`.trim() || u.username,
+  }));
   const [submitting, setSubmitting] = useState(false);
 
   const [form, setForm] = useState<CreateForm>(() => {
@@ -83,6 +82,7 @@ export default function AttendanceCreate() {
 
       if (result.success) {
         alert.success(result.message);
+        await queryClient.invalidateQueries({ queryKey: ["attendance"] });
         navigate(`/attendance/admin?month=${form.shift_date.substring(0, 7)}`);
       } else {
         alert.error(result.error);
@@ -107,7 +107,7 @@ export default function AttendanceCreate() {
 
   const isWorkType = form.leave_type === "work";
 
-  if (!hasPermission("attendance.admin")) return <Forbidden />;
+  if (!hasPermission("attendance.manage")) return <Forbidden />;
 
   return (
     <Skeleton