feat(25-01): Zod schemas, upsert service functions, passing tests

- Add upsertGlobalItemSchema and bulkUpsertGlobalItemsSchema to schemas.ts
- Add UpsertGlobalItemInput and BulkUpsertGlobalItemsInput types to types.ts
- Implement upsertGlobalItem with onConflictDoUpdate and tag sync
- Implement bulkUpsertGlobalItems processing array in single transaction
- Fix migration 0003 to only add new columns + unique constraint
- All 21 tests pass including 8 new upsert operation tests

tests/services/global-item.service.test.ts

@@ -312,9 +312,13 @@ describe("Global Item Service", () => {
 				imageSourceUrl: "https://apidura.com/images/handlebar-pack.jpg",
 			});
 
-			expect(result.item.sourceUrl).toBe("https://apidura.com/shop/handlebar-pack/");
+			expect(result.item.sourceUrl).toBe(
+				"https://apidura.com/shop/handlebar-pack/",
+			);
 			expect(result.item.imageCredit).toBe("Apidura Ltd");
-			expect(result.item.imageSourceUrl).toBe("https://apidura.com/images/handlebar-pack.jpg");
+			expect(result.item.imageSourceUrl).toBe(
+				"https://apidura.com/images/handlebar-pack.jpg",
+			);
 		});
 
 		it("upsertGlobalItem with tags creates tags and links them", async () => {