fix: consistent cost calculation for original vs routed models

Ensure Original Cost uses the same simulation logic as Routed Cost to prevent negative savings when using identity routing. Also bump version to 0.3.18.

app.py

@@ -2079,10 +2079,7 @@ def build_app():
                 routing_costs_list.append({"name": rm["name"], "tokens": tokens, "costs": costs, "cost": cost})
                 total_routing_cost += cost
 
-            if total_original_cost_from_df is not None:
-                total_original_cost = total_original_cost_from_df
-            else:
-                total_original_cost = calc_cost(total_original_tokens, base_prices)
+            total_original_cost = calc_cost(total_original_tokens, base_prices)
 
             total_routed_cost = total_base_cost + total_routing_cost
             savings = total_original_cost - total_routed_cost

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "routing-money-calculation"
-version = "0.1.0"
+version = "0.3.18"
 description = "Rough estimate of routing cost for AI agents"
 readme = "README.md"
 license = "Apache-2.0"