fix(api): дублировать маршруты под /api и убрать Content-Type у GET

backend/test/app.test.ts

@@ -12,6 +12,11 @@ test("GET /health returns ok", async () => {
   assert.ok(res.body.version.length > 0);
 });
 
+test("GET /api/health returns ok (prefix without proxy strip)", async () => {
+  const res = await request(app).get("/api/health").expect(200);
+  assert.equal(res.body.status, "ok");
+});
+
 test("GET /ready succeeds with mock database", async () => {
   const res = await request(app).get("/ready").expect(200);
   assert.equal(res.body.status, "ready");
@@ -34,6 +39,11 @@ test("GET /races accepts year and month", async () => {
   assert.ok(Array.isArray(res.body));
 });
 
+test("GET /api/races mirrors GET /races", async () => {
+  const res = await request(app).get("/api/races?year=2026&month=5").expect(200);
+  assert.ok(Array.isArray(res.body));
+});
+
 test("GET /races/:id returns not_found", async () => {
   const res = await request(app).get("/races/does-not-exist").expect(404);
   assert.equal(res.body.error, "not_found");