fix: remove incorrect anyhow::Result import and redundant impl block

Co-authored-by: aider (openai/andrew/openrouter/qwen/qwen3-coder) <aider@aider.chat>

src/modes/server/mcp/server.rs

@@ -1,4 +1,3 @@
-use anyhow::Result;
 use log::debug;
 use serde_json::Value;
 
@@ -14,9 +13,7 @@ impl KeepMcpServer {
     pub fn new(state: AppState) -> Self {
         Self { state }
     }
-}
 
-impl KeepMcpServer {
     pub async fn handle_request(&self, method: &str, params: Option<Value>) -> Result<String, ToolError> {
         debug!("MCP: Handling request '{}' with params: {:?}", method, params);