feat(ai-onboarding): enhance conversation flow, prompt rules & update Postman environment port to 8001

ai-patient-onboarding/app/api/onboarding.py

@@ -206,7 +206,8 @@ async def send_message(
     )
     t_ai_end = time.perf_counter()
 
-    # 7. Update state
+    # 7. Update state using shared intelligent merge
+    from app.ai.orchestrator import merge_state_updates
     current_state = json.loads(
         state.state_json
     )
@@ -215,17 +216,17 @@ async def send_message(
         "state_updates",
         {},
     )
+    if hasattr(updates, "model_dump"):
+        updates = updates.model_dump()
+    elif not isinstance(updates, dict):
+        updates = {}
 
-    for key, value in updates.items():
-        if value is not None:
-            if isinstance(value, list) and len(value) == 0:
-                continue
-            current_state[key] = value
+    merged_state = merge_state_updates(current_state, updates)
 
     onboarding_service.update_state(
         db=db,
         state=state,
-        data=current_state,
+        data=merged_state,
     )
 
     # 8. Update stage