refactor: split large modules and normalize rust layout

server-rs/crates/api-server/src/modules.rs

@@ -0,0 +1,15 @@
+pub mod admin;
+pub mod assets;
+pub mod auth;
+pub mod bark_battle;
+pub mod big_fish;
+pub mod custom_world;
+pub mod edutainment;
+pub mod health;
+pub mod internal;
+pub mod match3d;
+pub mod platform;
+pub mod profile;
+pub mod puzzle;
+pub mod square_hole;
+pub mod story;