Add company-scoped brand and company settings API.

brand now carries a NOT NULL company_id (unique per (company_id, name))
with brand.list/upsert/delete backed by resolveCompanyAccess. Adds
companysetting key-value store (list/get/set/delete, frontend flag).

src/store/brand/delete.js

@@ -0,0 +1,31 @@
+import { DELETE_BY_COMPANY_AND_ID } from '../../sql/brand.js';
+import resolveCompanyAccess from '../companyuser/resolveCompanyAccess.js';
+
+export default function del(pool) {
+  const access = resolveCompanyAccess(pool);
+
+  return async (googleAuthId, companyId, id) => {
+    if (!Number.isFinite(id)) {
+      throw new Error('Brand not found');
+    }
+
+    await access(googleAuthId, companyId);
+
+    try {
+      const result = await pool
+        .request()
+        .input('id', id)
+        .input('companyId', companyId)
+        .query(DELETE_BY_COMPANY_AND_ID);
+
+      if (!result.rowsAffected[0]) {
+        throw new Error('Brand not found');
+      }
+    } catch (err) {
+      if (err.number === 547) {
+        throw new Error('Brand in use');
+      }
+      throw err;
+    }
+  };
+}