Fix sales API proxy endpoints and tests

tests/test_gateway_proxy.py

@@ -150,6 +150,27 @@ def test_gateway_forwards_delete_requests(monkeypatch):
     assert DummyAsyncClient.last_request['url'].endswith('/queues/que_delete_me')
 
 
+def test_gateway_prefixes_sales_public_api_paths(monkeypatch):
+    monkeypatch.setattr(gateway_module.httpx, 'AsyncClient', DummyAsyncClient)
+    client = TestClient(gateway_module.app)
+
+    response = client.get('/proxy/sales/pipelines?limit=25')
+
+    assert response.status_code == 200
+    assert DummyAsyncClient.last_request['url'].endswith('/api/v1/pipelines')
+    assert DummyAsyncClient.last_request['params'] == {'limit': '25'}
+
+
+def test_gateway_does_not_prefix_sales_internal_paths(monkeypatch):
+    monkeypatch.setattr(gateway_module.httpx, 'AsyncClient', DummyAsyncClient)
+    client = TestClient(gateway_module.app)
+
+    response = client.post('/proxy/sales/internal/sales-sync/telegram', json={'chat_id': '123'})
+
+    assert response.status_code == 200
+    assert DummyAsyncClient.last_request['url'].endswith('/internal/sales-sync/telegram')
+
+
 def test_gateway_preserves_binary_audio_response(monkeypatch):
     async def request(self, method, url, params=None, content=None, headers=None):  # noqa: ANN001, ANN201
         return DummyResponse(
@@ -171,3 +192,20 @@ def test_gateway_preserves_binary_audio_response(monkeypatch):
     assert response.content == b'RIFFdemo'
     assert response.headers['content-type'].startswith('audio/wav')
     assert 'demo-call.wav' in response.headers['content-disposition']
+
+
+def test_gateway_returns_bad_gateway_when_upstream_unavailable(monkeypatch):
+    async def request(self, method, url, params=None, content=None, headers=None):  # noqa: ANN001, ANN201
+        raise gateway_module.httpx.ConnectError("All connection attempts failed")
+
+    monkeypatch.setattr(DummyAsyncClient, 'request', request)
+    monkeypatch.setattr(gateway_module.httpx, 'AsyncClient', DummyAsyncClient)
+    client = TestClient(gateway_module.app)
+
+    response = client.get('/proxy/sales/pipelines')
+
+    assert response.status_code == 502
+    assert response.json() == {
+        'detail': 'Upstream service unavailable',
+        'service': 'sales',
+    }