feat(clients): scaffold top-level Clients section with sub-nav around Accounts

backend/migrations/core/097_add_clients_feature_flag.js

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+/**
+ * Migration: Add the `clients` top-level feature flag.
+ *
+ * Introduces a parent flag for the "Clients" sidebar section, which
+ * groups customer accounts today and will host calendar / quotes /
+ * bills / messaging in future PRs. The existing `customerPortal` flag
+ * is unchanged and continues to gate the /customer/* surface plus the
+ * Accounts sub-page; it now lives logically beneath `clients` in the
+ * Features tab.
+ *
+ * Initial value: mirrors the install's current `customerPortal` value
+ * so an admin who had the customer portal enabled keeps seeing the
+ * Clients sidebar entry after upgrade, and an admin who had it off
+ * doesn't suddenly see a new sidebar entry.
+ *
+ * Idempotent: re-runs are no-ops.
+ */
+
+exports.up = async function(knex) {
+  if (!(await knex.schema.hasTable('feature_flags'))) return;
+
+  const existing = await knex('feature_flags').where({ key: 'clients' }).first();
+  if (existing) return;
+
+  const portalRow = await knex('feature_flags').where({ key: 'customerPortal' }).first();
+  let initialValue = false;
+  if (portalRow) {
+    const raw = portalRow.value;
+    initialValue = raw === true || raw === 1 || raw === '1' || raw === 'true';
+  }
+
+  await knex('feature_flags').insert({ key: 'clients', value: initialValue });
+};
+
+exports.down = async function(knex) {
+  if (!(await knex.schema.hasTable('feature_flags'))) return;
+  await knex('feature_flags').where({ key: 'clients' }).del();
+};