feat(items): adapt item flows to inventory schema defaults and SKU generation

tests/unit/use-cases/item.use-cases.test.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from "vitest"
+
+import { buildItemSku } from "@/use-cases/item.helpers"
+
+describe("item sku generation", () => {
+  it("builds a normalized sku from the item name", () => {
+    expect(buildItemSku("Item A!", 0)).toBe("ITEM-A")
+  })
+
+  it("adds a numeric suffix for repeated normalized names", () => {
+    expect(buildItemSku("Item A?", 1)).toBe("ITEM-A-2")
+  })
+})