debug: add logging to execute_unified_prompt_stream function

backend/routers/prompts.py

@@ -1452,6 +1452,7 @@ async def execute_unified_prompt_stream(
     save: bool = Query(False, description="Save result to ai_insights"),
     session: dict = Depends(require_auth_flexible)
 ):
+    print("[EXECUTE_STREAM] Endpoint function called!")  # DEBUG
     """
     Execute a unified prompt with Server-Sent Events (SSE) streaming.
 
@@ -1463,6 +1464,7 @@ async def execute_unified_prompt_stream(
 
     Use this endpoint for long-running workflows (>30s) to avoid gateway timeouts.
     """
+    print(f"[EXECUTE_STREAM] session={repr(session)}")  # DEBUG
     profile_id = session['profile_id']
 
     # Use default modules/timeframes (SSE doesn't support complex params)