feat(platform): aggregate realtime by vehicle

vehicle-data-platform/apps/api/internal/platform/handler_test.go

@@ -89,6 +89,21 @@ func TestHandlerRealtimeLocations(t *testing.T) {
 	}
 }
 
+func TestHandlerVehicleRealtime(t *testing.T) {
+	handler := NewHandler(NewService(NewMockStore()))
+	rec := httptest.NewRecorder()
+	req := httptest.NewRequest(http.MethodGet, "/api/realtime/vehicles?limit=10", nil)
+	handler.ServeHTTP(rec, req)
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status = %d body=%s", rec.Code, rec.Body.String())
+	}
+	for _, want := range []string{"protocols", "sourceCount", "primaryProtocol", "LB9A32A24R0LS1426"} {
+		if !strings.Contains(rec.Body.String(), want) {
+			t.Fatalf("response missing %q: %s", want, rec.Body.String())
+		}
+	}
+}
+
 func TestHandlerHistoryMileageQualityOps(t *testing.T) {
 	cases := []struct {
 		path string