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/sql/article.js

@@ -98,6 +98,24 @@ LEFT JOIN companyuser cu
     ON cu.company_id = co.id AND cu.google_auth_id = @googleAuthId
 `;
 
+export const UPDATE_UNIT = `
+UPDATE article
+SET unit_id = @unitId
+WHERE id = @articleId
+`;
+
+export const UPDATE_UNITAMOUNT = `
+UPDATE article
+SET unitamount = @unitamount
+WHERE id = @articleId
+`;
+
+export const UPDATE_UNIT_AND_AMOUNT = `
+UPDATE article
+SET unit_id = @unitId, unitamount = @unitamount
+WHERE id = @articleId
+`;
+
 export const CREATE = `
 INSERT INTO article (sku, unit_id, unitamount, weight)
 OUTPUT INSERTED.id