Allow overriding gateway URL (#169)

package.json

@@ -15,6 +15,7 @@
     "clean": "rm -rf out && rm -rf scaffold/node_modules",
     "start": "electron-forge start",
     "dev:engine": "DYAD_LOCAL_ENGINE=http://localhost:8080/v1 npm start",
+    "staging:gateway": "DYAD_GATEWAY_URL=https://staging---litellm-gcp-cloud-run-kq7pivehnq-uc.a.run.app/v1 npm start",
     "package": "npm run clean && electron-forge package",
     "make": "npm run clean && electron-forge make",
     "publish": "npm run clean && electron-forge publish",

src/ipc/utils/get_model_client.ts

@@ -14,6 +14,7 @@ import { llmErrorStore } from "@/main/llm_error_store";
 import { createDyadEngine } from "./llm_engine_provider";
 
 const dyadLocalEngine = process.env.DYAD_LOCAL_ENGINE;
+const dyadGatewayUrl = process.env.DYAD_GATEWAY_URL;
 
 const AUTO_MODELS = [
   {
@@ -105,7 +106,7 @@ export async function getModelClient(
           })
         : createOpenAI({
             apiKey: dyadApiKey,
-            baseURL: "https://llm-gateway.dyad.sh/v1",
+            baseURL: dyadGatewayUrl ?? "https://llm-gateway.dyad.sh/v1",
           });
 
       logger.info(