fix: sanitize URL concatenation in AHM callback service to prevent double slashes

src/aeros_simulation/service.py

@@ -37,7 +37,7 @@ active_simulations = {}
 
 async def call_ahm_callback_service(simulation_id: str, job_id: str):
     from src.config import AHM_BASE_URL, AHM_SIMULATION_CALLBACK_URL
-    url = f"{AHM_BASE_URL}{AHM_SIMULATION_CALLBACK_URL}"
+    url = f"{AHM_BASE_URL.rstrip('/')}/{AHM_SIMULATION_CALLBACK_URL.lstrip('/')}"
     payload = {
         "simulation_id": simulation_id,
         "job_id": job_id,