feat(movements): gate StockMovementLine on trackingType QUANTITY

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

@@ -151,6 +151,12 @@ describe("item use-cases", () => {
       minStock: 2,
       targetStock: 8,
     })
+
+    const stockMovements = await prisma.inventoryMovement.findMany({
+      where: { stockLines: { some: { itemId: item.id } } },
+    })
+
+    expect(stockMovements).toHaveLength(1)
   })
 
   it("rejects duplicate item names", async () => {
@@ -285,6 +291,78 @@ describe("item use-cases", () => {
     })
   })
 
+  it("creates a SERIALIZED item with stock value and persists stock as 0 with no movement", async () => {
+    const actor = await createTestUser(prisma)
+    const category = await createTestCategory(prisma)
+
+    const result = await createItemUseCase({
+      actorId: actor.id,
+      name: "Phone",
+      categoryId: category.id,
+      stock: 3,
+      trackingType: "SERIALIZED",
+    })
+
+    expect(result).toEqual({ success: true })
+
+    const item = await prisma.item.findUniqueOrThrow({
+      where: { sku: "PHONE" },
+    })
+
+    expect(item).toMatchObject({
+      stock: 0,
+      trackingType: "SERIALIZED",
+    })
+
+    const movements = await prisma.inventoryMovement.findMany({
+      where: { stockLines: { some: { itemId: item.id } } },
+    })
+
+    expect(movements).toHaveLength(0)
+  })
+
+  it("updates a SERIALIZED item with stock value and leaves stock unchanged with no movement", async () => {
+    const actor = await createTestUser(prisma)
+    const category = await createTestCategory(prisma)
+
+    const created = await createItemUseCase({
+      actorId: actor.id,
+      name: "Tablet",
+      categoryId: category.id,
+      stock: 0,
+      trackingType: "SERIALIZED",
+    })
+
+    expect(created).toEqual({ success: true })
+
+    const item = await prisma.item.findUniqueOrThrow({
+      where: { sku: "TABLET" },
+    })
+
+    const updated = await updateItemUseCase({
+      actorId: actor.id,
+      id: item.id,
+      name: "Tablet",
+      categoryId: category.id,
+      stock: 5,
+      trackingType: "SERIALIZED",
+    })
+
+    expect(updated).toEqual({ success: true })
+
+    const refreshedItem = await prisma.item.findUniqueOrThrow({
+      where: { id: item.id },
+    })
+
+    expect(refreshedItem.stock).toBe(0)
+
+    const movements = await prisma.inventoryMovement.findMany({
+      where: { stockLines: { some: { itemId: item.id } } },
+    })
+
+    expect(movements).toHaveLength(0)
+  })
+
   it("blocks deleting items with stock and soft deletes empty items", async () => {
     const actor = await createTestUser(prisma)
     const category = await createTestCategory(prisma)