fix: remove unnecessary cfg(test) attributes from test modules

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

src/tests/mod.rs

@@ -1,16 +1,8 @@
-#[cfg(test)]
 pub mod compression;
-#[cfg(test)]
 pub mod compression_types;
-#[cfg(test)]
 pub mod compression_engine;
-#[cfg(test)]
 pub mod meta_plugin;
-#[cfg(test)]
 pub mod modes;
-#[cfg(test)]
 pub mod server;
-#[cfg(test)]
 pub mod common;
-#[cfg(test)]
 pub mod db;