fix: Implement Clone for FilterChain manually

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

src/filter_plugin/mod.rs

@@ -26,11 +26,20 @@ enum FilterType {
     StripAnsi,
 }
 
-#[derive(Clone)]
 pub struct FilterChain {
     plugins: Vec<Box<dyn FilterPlugin>>,
 }
 
+impl Clone for FilterChain {
+    fn clone(&self) -> Self {
+        let mut plugins = Vec::with_capacity(self.plugins.len());
+        for plugin in &self.plugins {
+            plugins.push(plugin.clone_box());
+        }
+        FilterChain { plugins }
+    }
+}
+
 impl FilterChain {
     pub fn new() -> Self {
         Self {