LLM支持优化

src/config/mod.rs

@@ -111,9 +111,13 @@ pub struct LlmConfig {
     #[serde(default)]
     pub api_key: Option<String>,
 
-    /// Enable thinking/reasoning mode (deepseek, kimi)
+    /// Enable thinking/reasoning mode (deepseek, kimi, anthropic)
     #[serde(default)]
     pub thinking_enabled: bool,
+
+    /// Budget tokens for thinking mode (Anthropic Claude 4)
+    #[serde(default)]
+    pub thinking_budget_tokens: Option<u32>,
 }
 
 fn default_api_key_storage() -> String {
@@ -132,6 +136,7 @@ impl Default for LlmConfig {
             api_key_storage: default_api_key_storage(),
             api_key: None,
             thinking_enabled: false,
+            thinking_budget_tokens: None,
         }
     }
 }