feat: add Condo owner desk frontend and backend

backend/tests/postgres-repository.test.ts

@@ -0,0 +1,19 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { dateValue } from "../src/postgres-repository.js";
+
+test("database date serialization preserves the local calendar date", () => {
+  const previousTimezone = process.env.TZ;
+  process.env.TZ = "Asia/Shanghai";
+
+  try {
+    const databaseDate = new Date(2026, 7, 10);
+
+    assert.equal(databaseDate.toISOString().slice(0, 10), "2026-08-09");
+    assert.equal(dateValue(databaseDate), "2026-08-10");
+    assert.equal(dateValue("2026-08-10"), "2026-08-10");
+  } finally {
+    if (previousTimezone === undefined) delete process.env.TZ;
+    else process.env.TZ = previousTimezone;
+  }
+});