feat: expand assistant providers and polish experience

apps/docs/docs/management/settings/index.mdx

@@ -21,8 +21,9 @@ It is available to signed-in users from the header, the user menu, and the `Cmd/
 
 ### Configure a model provider
 
-Homarr supports OpenRouter, OpenAI, Ollama, LM Studio, and custom services that implement the OpenAI
-Chat Completions API.
+Homarr includes presets for OpenRouter, OpenAI, Anthropic Claude, Google Gemini, xAI, Groq, Mistral AI,
+DeepSeek, Together AI, Ollama, and LM Studio. A custom preset connects any other service that implements
+the OpenAI Chat Completions API.
 
 1. Choose a provider preset or **Custom endpoint**.
 2. Confirm the API base URL. It usually ends in `/v1`.
@@ -52,6 +53,11 @@ The configured endpoint must support streaming Chat Completions and structured t
 assistant experience. Model discovery alone does not guarantee tool support, except when OpenRouter
 explicitly advertises the model's `tools` capability.
 
+The Claude preset uses Anthropic's OpenAI SDK compatibility layer. Anthropic describes that layer as
+suited to testing and comparison rather than as its full native API; unsupported OpenAI fields may be
+ignored. Streaming responses and tool calls are supported, which are the capabilities Homarr Assistant
+uses. Choose OpenRouter or another provider when you prefer a provider-neutral production endpoint.
+
 ### Conversations and tools
 
 Conversations and messages are stored per user in the Homarr database. Users can start, revisit, archive,