Add POS terminal category visibility system

Add posterminal and posterminalcategory tables to control which categories
are visible on each POS terminal. The existence of a row in
posterminalcategory means the category is visible on that terminal.

Store methods:
- posterminal.list/upsert/delete - CRUD for terminals
- posterminal.setOn/setOff - toggle single category on a terminal
- posterminal.setOnAll/setOffAll - toggle all categories on a terminal
- posterminal.getCategoryPosterminalIds - internal, used by category tree

The category tree (getTreeForCompany) now includes a posterminalIds array
on each node listing which terminals have that category enabled.

src/store/posterminal/setOff.js

@@ -0,0 +1,39 @@
+import { GET_BY_ID, SET_OFF, LIST_CATEGORY_IDS } from '../../sql/posterminal.js';
+import resolveCompanyAccess from '../companyuser/resolveCompanyAccess.js';
+
+export default function setOff(pool) {
+  const access = resolveCompanyAccess(pool);
+
+  return async (googleAuthId, companyId, posterminalId, categoryId) => {
+    if (!Number.isFinite(posterminalId) || !Number.isFinite(categoryId)) {
+      throw new Error('Invalid posterminal or category');
+    }
+
+    await access(googleAuthId, companyId);
+
+    const existing = await pool
+      .request()
+      .input('id', posterminalId)
+      .query(GET_BY_ID);
+
+    if (!existing.recordset[0] || existing.recordset[0].companyId !== companyId) {
+      throw new Error('Posterminal not found');
+    }
+
+    await pool
+      .request()
+      .input('posterminalId', posterminalId)
+      .input('categoryId', categoryId)
+      .query(SET_OFF);
+
+    const result = await pool
+      .request()
+      .input('posterminalId', posterminalId)
+      .query(LIST_CATEGORY_IDS);
+
+    return {
+      id: posterminalId,
+      categoryIds: result.recordset.map((r) => r.categoryId),
+    };
+  };
+}