implement website share functionality using share table

- Add support for multiple share URLs per website with server-generated slugs
- Create shares API endpoint for listing and creating website shares
- Add SharesTable, ShareEditButton, ShareDeleteButton components
- Move share management to website settings, remove header share button
- Remove shareId from website update API (now uses separate share table)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/(main)/websites/[websiteId]/WebsiteHeader.tsx

@@ -1,11 +1,9 @@
 import { Icon, Row, Text } from '@umami/react-zen';
-import { WebsiteShareForm } from '@/app/(main)/websites/[websiteId]/settings/WebsiteShareForm';
 import { Favicon } from '@/components/common/Favicon';
 import { LinkButton } from '@/components/common/LinkButton';
 import { PageHeader } from '@/components/common/PageHeader';
 import { useMessages, useNavigation, useWebsite } from '@/components/hooks';
-import { Edit, Share } from '@/components/icons';
-import { DialogButton } from '@/components/input/DialogButton';
+import { Edit } from '@/components/icons';
 import { ActiveUsers } from '@/components/metrics/ActiveUsers';
 
 export function WebsiteHeader({ showActions }: { showActions?: boolean }) {
@@ -29,29 +27,14 @@ export function WebsiteHeader({ showActions }: { showActions?: boolean }) {
         <ActiveUsers websiteId={website.id} />
 
         {showActions && (
-          <Row alignItems="center" gap>
-            <ShareButton websiteId={website.id} shareId={website.shareId} />
-            <LinkButton href={renderUrl(`/websites/${website.id}/settings`, false)}>
-              <Icon>
-                <Edit />
-              </Icon>
-              <Text>{formatMessage(labels.edit)}</Text>
-            </LinkButton>
-          </Row>
+          <LinkButton href={renderUrl(`/websites/${website.id}/settings`, false)}>
+            <Icon>
+              <Edit />
+            </Icon>
+            <Text>{formatMessage(labels.edit)}</Text>
+          </LinkButton>
         )}
       </Row>
     </PageHeader>
   );
 }
-
-const ShareButton = ({ websiteId, shareId }) => {
-  const { formatMessage, labels } = useMessages();
-
-  return (
-    <DialogButton icon={<Share />} label={formatMessage(labels.share)} width="800px">
-      {({ close }) => {
-        return <WebsiteShareForm websiteId={websiteId} shareId={shareId} onClose={close} />;
-      }}
-    </DialogButton>
-  );
-};