Add company-scoped unit list/upsert/delete and article unit patches.

Units are isolated per company; article detail exposes full unit shape, and unused units can be deleted safely via FK NO ACTION.

src/store/unit/shapeUnit.js

@@ -0,0 +1,11 @@
+function shapeUnit(row) {
+  return {
+    si: row.si,
+    basesi: row.basesi,
+    basesifactor: row.basesifactor,
+    symbol: row.symbol ?? null,
+    name: row.name ?? null,
+  };
+}
+
+export default shapeUnit;