feat: add Condo owner desk frontend and backend

backend/tests/errors.test.ts

@@ -0,0 +1,34 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { mapDatabaseError } from "../src/errors.js";
+
+test("database business errors map to stable API responses", () => {
+  const insufficient = mapDatabaseError({
+    code: "P0001",
+    message: "CONDON_INSUFFICIENT_BALANCE"
+  });
+  assert.equal(insufficient.statusCode, 422);
+  assert.equal(insufficient.code, "INSUFFICIENT_BALANCE");
+
+  const duplicate = mapDatabaseError({
+    code: "23505",
+    message: "CONDON_CONFIRMATION_NO_EXISTS"
+  });
+  assert.equal(duplicate.statusCode, 409);
+  assert.equal(duplicate.code, "CONFLICT");
+
+  const invalid = mapDatabaseError({
+    code: "22023",
+    message: "CONDON_CROSS_YEAR_STAY_NOT_SUPPORTED"
+  });
+  assert.equal(invalid.statusCode, 400);
+  assert.equal(invalid.code, "BUSINESS_RULE_VIOLATION");
+
+  const unknown = mapDatabaseError({
+    code: "XX000",
+    message: "internal database details"
+  });
+  assert.equal(unknown.statusCode, 500);
+  assert.equal(unknown.message, "An internal error occurred");
+  assert.equal(unknown.message.includes("database details"), false);
+});