feat: add acquisition API foundation

Add acquisition persistence, cost-basis calculation, seller-scoped admin routes, contracts, validation, migration, and focused application/HTTP tests.

packages/validation/acquisition.js

@@ -0,0 +1,16 @@
+import { z } from 'zod';
+
+export const createAcquisitionSchema = z.object({
+  inventoryItemId: z.uuid(),
+  method: z.string().trim().min(1).max(100),
+  costMinor: z.int().nonnegative(),
+  currency: z.string().trim().regex(/^[A-Za-z]{3}$/).optional(),
+  date: z.string().trim().max(10).optional(),
+  source: z.string().trim().max(255).optional(),
+  location: z.string().trim().max(255).optional(),
+  shippingMinor: z.int().nonnegative().optional(),
+  taxMinor: z.int().nonnegative().optional(),
+  otherFeesMinor: z.int().nonnegative().optional(),
+  estimatedTradeValueMinor: z.int().nonnegative().optional(),
+  notes: z.string().trim().max(10000).optional(),
+}).strict();

packages/validation/package.json

@@ -4,6 +4,7 @@
   "type": "module",
   "exports": {
     "./auth": "./auth.js",
+    "./acquisition": "./acquisition.js",
     "./inventory": "./inventory.js",
     "./image": "./image.js",
     "./listing": "./listing.js",