feat(openclaw): register suggested models to allowlist on provider add

When adding an OpenClaw provider with suggestedDefaults, automatically
merge its model catalog into the allowlist and set the default model
if not already configured.

src/lib/api/index.ts

@@ -7,7 +7,7 @@ export { skillsApi } from "./skills";
 export { usageApi } from "./usage";
 export { vscodeApi } from "./vscode";
 export { proxyApi } from "./proxy";
-export { sessionsApi } from "./sessions";
+export { openclawApi } from "./openclaw";
 export * as configApi from "./config";
 export type { ProviderSwitchEvent } from "./providers";
 export type { Prompt } from "./prompts";