fix: Resolve compilation errors with missing imports and closure moves

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/filter_plugin/mod.rs

@@ -1,6 +1,6 @@
 use std::io::{Result, Read, Write};
 use std::str::FromStr;
-use strum::{EnumString, EnumVariantNames};
+use strum::EnumString;
 
 pub mod head;
 pub mod tail;