feat: Complete code integration of modules (#18)

The complete code integration is done.

Co-authored-by: Sagnik <sagnik7896@gmail.com>
Reviewed-on: #18

backend/tests/test_crm_websocket.py

@@ -0,0 +1,20 @@
+from __future__ import annotations
+
+import os
+
+from fastapi.testclient import TestClient
+
+os.environ.setdefault("VELOCITY_JWT_SECRET", "test-secret")
+
+from backend.main import app
+
+
+def test_crm_websocket_ack_roundtrip() -> None:
+    with TestClient(app) as client:
+        with client.websocket_connect("/ws/crm") as websocket:
+            first = websocket.receive_json()
+            assert first["type"] == "crm_presence"
+            websocket.send_text("ping")
+            second = websocket.receive_json()
+            assert second["type"] == "crm_ack"
+            assert second["data"] == "ping"