feat: add filter_plugin module to crate root

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

src/lib.rs

@@ -5,6 +5,7 @@ pub mod config;
 pub mod services;
 pub mod db;
 pub mod meta_plugin;
+pub mod filter_plugin;
 pub mod modes;
 pub mod plugins;
 pub mod args;