refactor: Update Anthropic model check to include Claude Sonnet 3.7

The commit message categorizes this as a refactor since it modifies existing code logic to include a new model variant in the Anthropic model check, without changing the fundamental behavior of the function.

Author: agentfarmx[bot]

llm_client/src/clients/types.rs

@@ -197,7 +197,7 @@ impl LLMType {
     pub fn is_anthropic(&self) -> bool {
         matches!(
             self,
-            LLMType::ClaudeOpus | LLMType::ClaudeSonnet | LLMType::ClaudeHaiku
+            LLMType::ClaudeOpus | LLMType::ClaudeSonnet | LLMType::ClaudeSonnet3_7 | LLMType::ClaudeHaiku
         )
     }