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]/settings/SharesTable.tsx

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+import { DataColumn, DataTable, type DataTableProps, Row } from '@umami/react-zen';
+import { DateDistance } from '@/components/common/DateDistance';
+import { ExternalLink } from '@/components/common/ExternalLink';
+import { useConfig, useMessages } from '@/components/hooks';
+import { ShareDeleteButton } from './ShareDeleteButton';
+import { ShareEditButton } from './ShareEditButton';
+
+export function SharesTable(props: DataTableProps) {
+  const { formatMessage, labels } = useMessages();
+  const { cloudMode } = useConfig();
+
+  const getUrl = (slug: string) => {
+    if (cloudMode) {
+      return `${process.env.cloudUrl}/share/${slug}`;
+    }
+    return `${window?.location.origin}${process.env.basePath || ''}/share/${slug}`;
+  };
+
+  return (
+    <DataTable {...props}>
+      <DataColumn id="slug" label={formatMessage(labels.shareUrl)}>
+        {({ slug }: any) => {
+          const url = getUrl(slug);
+          return (
+            <ExternalLink href={url} prefetch={false}>
+              {url}
+            </ExternalLink>
+          );
+        }}
+      </DataColumn>
+      <DataColumn id="created" label={formatMessage(labels.created)} width="200px">
+        {(row: any) => <DateDistance date={new Date(row.createdAt)} />}
+      </DataColumn>
+      <DataColumn id="action" align="end" width="100px">
+        {({ id, slug }: any) => {
+          return (
+            <Row>
+              <ShareEditButton shareId={id} />
+              <ShareDeleteButton shareId={id} slug={slug} />
+            </Row>
+          );
+        }}
+      </DataColumn>
+    </DataTable>
+  );
+}