feat(agent): 移除未使用的导入并简化条件表达式

src/llm/provider/openai.rs

@@ -22,7 +22,7 @@ use serde_json::Value;
 use tracing::{debug, error, info};
 
 use super::{LlmProvider, ProviderCapabilities, ProviderFeatures};
-use crate::llm::convert::{blocks_to_content, content_to_blocks, from_openai, to_openai};
+use crate::llm::convert::{from_openai, to_openai};
 use crate::llm::error::LlmError;
 use crate::llm::types::message::{ContentBlock, ContentBlockType, Message};
 use crate::llm::types::openai_message::{ContentField, OpenaiChatMessage};