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/Attendance.tsx

@@ -244,7 +244,7 @@ export default function Attendance() {
 
       if (result.success) {
         await queryClient.invalidateQueries({
-          queryKey: ["attendance", "status"],
+          queryKey: ["attendance"],
         });
         punchTimeoutRef.current = setTimeout(() => {
           alert.success(result.data?.message || result.message || "Uloženo");
@@ -271,7 +271,7 @@ export default function Attendance() {
       const result = await response.json();
       if (result.success) {
         await queryClient.invalidateQueries({
-          queryKey: ["attendance", "status"],
+          queryKey: ["attendance"],
         });
         alert.success(
           result.data?.message || result.message || "Přestávka zaznamenána",
@@ -297,6 +297,7 @@ export default function Attendance() {
 
       const result = await response.json();
       if (result.success) {
+        await queryClient.invalidateQueries({ queryKey: ["attendance"] });
         alert.success("Poznámka byla uložena");
       } else {
         alert.error(result.error);
@@ -319,7 +320,7 @@ export default function Attendance() {
       const result = await response.json();
       if (result.success) {
         await queryClient.invalidateQueries({
-          queryKey: ["attendance", "status"],
+          queryKey: ["attendance"],
         });
         alert.success(
           result.data?.message || result.message || "Projekt přepnut",
@@ -363,7 +364,13 @@ export default function Attendance() {
       if (result.success) {
         setIsLeaveModalOpen(false);
         await queryClient.invalidateQueries({
-          queryKey: ["attendance", "status"],
+          queryKey: ["attendance"],
+        });
+        await queryClient.invalidateQueries({
+          queryKey: ["leave-requests"],
+        });
+        await queryClient.invalidateQueries({
+          queryKey: ["leave"],
         });
         await new Promise((resolve) => setTimeout(resolve, 300));
         alert.success(
@@ -910,7 +917,7 @@ export default function Attendance() {
                 <path d="M9 18l6-6-6-6" />
               </svg>
             </Link>
-            {hasPermission("attendance.admin") && (
+            {hasPermission("attendance.manage") && (
               <Link to="/attendance/admin" className="attendance-quick-link">
                 <svg
                   width="20"