fix: add timeouts to model fetchers and send router models incrementally

Addresses #11747 where blocked DNS for provider domains (e.g. openrouter.ai,
router.requesty.ai) caused all providers to hang until the DNS timeout expired,
even for providers with working DNS.

Changes:
1. Add 10-second timeout to axios.get() calls in openrouter.ts, requesty.ts,
   unbound.ts, and vercel-ai-gateway.ts fetchers. The roo.ts and litellm.ts
   fetchers already had timeouts.

2. Send router models incrementally in the requestRouterModels handler: each
   provider posts its models to the webview as soon as it resolves, rather
   than waiting for all providers to finish via Promise.allSettled. A final
   aggregated message is still sent for backward compatibility.

src/api/providers/fetchers/openrouter.ts

@@ -99,7 +99,7 @@ export async function getOpenRouterModels(options?: ApiHandlerOptions): Promise<
 	const baseURL = options?.openRouterBaseUrl || "https://openrouter.ai/api/v1"
 
 	try {
-		const response = await axios.get<OpenRouterModelsResponse>(`${baseURL}/models`)
+		const response = await axios.get<OpenRouterModelsResponse>(`${baseURL}/models`, { timeout: 10_000 })
 		const result = openRouterModelsResponseSchema.safeParse(response.data)
 		const data = result.success ? result.data.data : response.data.data
 
@@ -147,7 +147,9 @@ export async function getOpenRouterModelEndpoints(
 	const baseURL = options?.openRouterBaseUrl || "https://openrouter.ai/api/v1"
 
 	try {
-		const response = await axios.get<OpenRouterModelEndpointsResponse>(`${baseURL}/models/${modelId}/endpoints`)
+		const response = await axios.get<OpenRouterModelEndpointsResponse>(`${baseURL}/models/${modelId}/endpoints`, {
+			timeout: 10_000,
+		})
 		const result = openRouterModelEndpointsResponseSchema.safeParse(response.data)
 		const data = result.success ? result.data.data : response.data.data
 

src/api/providers/fetchers/requesty.ts

@@ -18,7 +18,7 @@ export async function getRequestyModels(baseUrl?: string, apiKey?: string): Prom
 		const resolvedBaseUrl = toRequestyServiceUrl(baseUrl)
 		const modelsUrl = new URL("v1/models", resolvedBaseUrl)
 
-		const response = await axios.get(modelsUrl.toString(), { headers })
+		const response = await axios.get(modelsUrl.toString(), { headers, timeout: 10_000 })
 		const rawModels = response.data.data
 
 		for (const rawModel of rawModels) {

src/api/providers/fetchers/unbound.ts

@@ -14,7 +14,7 @@ export async function getUnboundModels(apiKey?: string | null): Promise<Record<s
 			headers["Authorization"] = `Bearer ${apiKey}`
 		}
 
-		const response = await axios.get("https://api.getunbound.ai/models", { headers })
+		const response = await axios.get("https://api.getunbound.ai/models", { headers, timeout: 10_000 })
 		const rawModels = response.data?.data ?? response.data
 
 		for (const rawModel of rawModels) {

src/api/providers/fetchers/vercel-ai-gateway.ts

@@ -58,7 +58,7 @@ export async function getVercelAiGatewayModels(options?: ApiHandlerOptions): Pro
 	const baseURL = "https://ai-gateway.vercel.sh/v1"
 
 	try {
-		const response = await axios.get<VercelAiGatewayModelsResponse>(`${baseURL}/models`)
+		const response = await axios.get<VercelAiGatewayModelsResponse>(`${baseURL}/models`, { timeout: 10_000 })
 		const result = vercelAiGatewayModelsResponseSchema.safeParse(response.data)
 		const data = result.success ? result.data.data : response.data.data
 

src/core/webview/webviewMessageHandler.ts

@@ -956,10 +956,23 @@ export const webviewMessageHandler = async (
 				await flushModels(targetCandidate.options, true)
 			}
 
+			// Fetch models incrementally: send each provider's models to the webview
+			// as soon as they resolve, rather than waiting for all providers to finish.
+			// This ensures providers with working DNS are available immediately while
+			// blocked providers fail gracefully in the background (see #11747).
 			const results = await Promise.allSettled(
 				modelFetchPromises.map(async ({ key, options }) => {
 					const models = await safeGetModels(options)
-					return { key, models } // The key is `ProviderName` here.
+
+					// Send this provider's models to the webview immediately.
+					routerModels[key] = models
+					provider.postMessageToWebview({
+						type: "routerModels",
+						routerModels: { ...routerModels },
+						values: providerFilter ? { provider: requestedProvider } : undefined,
+					})
+
+					return { key, models }
 				}),
 			)
 
@@ -968,8 +981,6 @@ export const webviewMessageHandler = async (
 
 				if (result.status === "fulfilled") {
 					routerModels[routerName] = result.value.models
-
-					// Ollama and LM Studio settings pages still need these events. They are not fetched here.
 				} else {
 					// Handle rejection: Post a specific error message for this provider.
 					const errorMessage = result.reason instanceof Error ? result.reason.message : String(result.reason)
@@ -986,6 +997,7 @@ export const webviewMessageHandler = async (
 				}
 			})
 
+			// Send final aggregated message for backward compatibility.
 			provider.postMessageToWebview({
 				type: "routerModels",
 				routerModels,