Fix circular import in API routers

api/dependencies.py

@@ -0,0 +1,3 @@
+from tinytroupe.simulation_manager import SimulationManager
+
+simulation_manager = SimulationManager()

api/main.py

@@ -1,10 +1,8 @@
 from fastapi import FastAPI
-from tinytroupe.simulation_manager import SimulationManager
+from api.dependencies import simulation_manager
 
 app = FastAPI(title="Tiny Factory & Artificial Societies API")
 
-simulation_manager = SimulationManager()
-
 @app.get("/health")
 def health():
     return {"status": "ok"}

api/routers/personas.py

@@ -1,7 +1,7 @@
 from fastapi import APIRouter, HTTPException
 from typing import List, Dict
 from pydantic import BaseModel
-from api.main import simulation_manager
+from api.dependencies import simulation_manager
 
 router = APIRouter()
 

api/routers/simulations.py

@@ -2,7 +2,7 @@ from fastapi import APIRouter, HTTPException, BackgroundTasks, Depends
 from typing import List, Optional, Dict
 from pydantic import BaseModel
 from datetime import datetime
-from api.main import simulation_manager
+from api.dependencies import simulation_manager
 from tinytroupe.simulation_manager import SimulationConfig
 
 router = APIRouter()