feat: use custom Base URL for OpenRouter model list fetch

When a custom Base URL is configured for the OpenRouter provider,
Roo Code now uses that URL to fetch the list of available models
instead of always hitting the public OpenRouter API.

Changes:
- webviewMessageHandler.ts: Pass openRouterBaseUrl to the openrouter candidate options
- modelCache.ts: Forward baseUrl option to getOpenRouterModels()

Fixes #11150

Author: roomote

src/api/providers/fetchers/modelCache.ts

@@ -67,7 +67,7 @@ async function fetchModelsFromProvider(options: GetModelsOptions): Promise<Model
 
 	switch (provider) {
 		case "openrouter":
-			models = await getOpenRouterModels()
+			models = await getOpenRouterModels({ openRouterBaseUrl: options.baseUrl })
 			break
 		case "requesty":
 			// Requesty models endpoint requires an API key for per-user custom policies.

src/core/webview/webviewMessageHandler.ts

@@ -894,7 +894,7 @@ export const webviewMessageHandler = async (
 
 			// Base candidates (only those handled by this aggregate fetcher)
 			const candidates: { key: RouterName; options: GetModelsOptions }[] = [
-				{ key: "openrouter", options: { provider: "openrouter" } },
+				{ key: "openrouter", options: { provider: "openrouter", baseUrl: apiConfiguration.openRouterBaseUrl } },
 				{
 					key: "requesty",
 					options: {