api: switch license endpoint to POST/JSON, fix active check, add key copy button

- Change /api/v1/license from GET with query params to POST with JSON body
- Request body uses license_key and email_address
- Response returns key, email_address, subscription_level
- Add active check (reject deactivated license keys)
- Exclude /api/v1/automations/ from API key auth (GHL webhook)
- Add copyableFields prop to AdminTable with clipboard icon
- Enable copy button on license key field in license-keys admin page

src/routes/(protected)/admin/license-keys/+page.svelte

@@ -68,6 +68,7 @@
 		searchFields={config.searchFields}
 		fieldTypes={config.fieldTypes}
 		singular={config.displayNameSingular}
+		copyableFields={['key']}
 		onRowClick={openReplace}
 	/>
 </div>