Add unit API and article unitamount/unitSi patch.

Units use the selected company; article PATCH accepts name/unitamount/unitSi.

scripts/generateApiDocs.js

@@ -33,6 +33,7 @@ const options = {
             { name: 'Article', description: 'Articles under categories' },
             { name: 'Category', description: 'Category tree and membership' },
             { name: 'Company', description: 'Company CRUD' },
+            { name: 'Unit', description: 'Company-scoped units of measure' },
             { name: 'Image', description: 'Content-addressed AVIF by fullHash' },
         ],
     },