feat(ai): added support for custom moonshot base url and kimi api key

- Added `MOONSHOT_BASE_URL` environment variable support to redirect requests to the Kimi China platform.
- Enabled `KIMI_API_KEY` as an alias for the moonshot provider to improve user experience.

Fixes #2883

packages/ai/src/providers/openai-shared.ts

@@ -155,6 +155,16 @@ export function resolveOpenAIRequestSetup(
 
 	let copilotPremiumRequests: number | undefined;
 	let baseUrl = model.baseUrl;
+	if (model.provider === "moonshot") {
+		// Bundled `moonshot` catalog models hardcode the international endpoint
+		// (`api.moonshot.ai`). MOONSHOT_BASE_URL lets users redirect the provider
+		// at the China platform (`api.moonshot.cn`), which only accepts China keys
+		// and rejects the international host. (#2883)
+		const moonshotBaseUrl = $env.MOONSHOT_BASE_URL?.trim();
+		if (moonshotBaseUrl) {
+			baseUrl = moonshotBaseUrl;
+		}
+	}
 	if (model.provider === "github-copilot") {
 		apiKey = parseGitHubCopilotApiKey(rawApiKey).accessToken;
 		const copilot = buildCopilotDynamicHeaders({

packages/catalog/src/provider-models/descriptors.ts

@@ -219,7 +219,9 @@ export const CATALOG_PROVIDERS = [
 	{
 		id: "moonshot",
 		defaultModel: "kimi-k2.7-code",
-		envVars: ["MOONSHOT_API_KEY"],
+		// KIMI_API_KEY is the most intuitive name for a Kimi/Moonshot key; accept it
+		// as a fallback so China users need not learn MOONSHOT_API_KEY. (#2883)
+		envVars: ["MOONSHOT_API_KEY", "KIMI_API_KEY"],
 		createModelManagerOptions: (config: ModelManagerConfig) => moonshotModelManagerOptions(config),
 		catalogDiscovery: { label: "Moonshot" },
 	},

packages/catalog/src/provider-models/openai-compat.ts

@@ -2493,7 +2493,10 @@ export function moonshotModelManagerOptions(
 	config?: MoonshotModelManagerConfig,
 ): ModelManagerOptions<"openai-completions"> {
 	const apiKey = config?.apiKey;
-	const baseUrl = config?.baseUrl ?? "https://api.moonshot.ai/v1";
+	// `MOONSHOT_BASE_URL` redirects discovery (and the streaming request that
+	// inherits this baseUrl) at the Kimi China platform `api.moonshot.cn`; an
+	// explicit `config.baseUrl` still wins. Mirrors LITELLM_BASE_URL/LM_STUDIO_BASE_URL. (#2883)
+	const baseUrl = config?.baseUrl ?? Bun.env.MOONSHOT_BASE_URL ?? "https://api.moonshot.ai/v1";
 	const references = createBundledReferenceMap<"openai-completions">("moonshot");
 	return {
 		providerId: "moonshot",