LocalLM Lab adds online model providers (OpenAI, Anthropic, OpenRouter) to the model layer

Continuing from the model-layer topic from a couple weeks back, LocalLM Lab 1.0.0-beta.3 extends the model layer to online providers. A new RemoteModelProvider ships in a fourth binary, LocalLMLabSDKRemote (pure URLSession, no third-party dependencies). It's configured through RemoteProviderConfig: scheme, dialect (.openAIChat / .openAIResponses / .anthropicMessages / .openAICompatible), baseURL, auth, models — with presets for .openAI, .openAIResponses, .anthropic, .openRouter, and .openAIComp...