🧹 Major warning cleanup: 200+ → 102 warnings (50% reduction)

- Fix TokenType enum naming convention (SNAKE_CASE → CamelCase)
- Remove 60+ unused imports across multiple modules
- Clean up interpreter, backend, and box modules
- LLVM build now passes with significantly fewer warnings

src/interpreter/expressions/calls.rs

@@ -4,15 +4,13 @@
 
 use super::*;
 use crate::ast::ASTNode;
-use crate::box_trait::{NyashBox, StringBox, IntegerBox, BoolBox, VoidBox};
-use crate::boxes::{ArrayBox, FloatBox, MapBox, FutureBox};
-use crate::boxes::{BufferBox, JSONBox, HttpClientBox, StreamBox, RegexBox, IntentBox, SocketBox};
-use crate::boxes::{HTTPServerBox, HTTPRequestBox, HTTPResponseBox, MathBox, TimeBox, DateTimeBox};
+use crate::box_trait::{NyashBox, StringBox, IntegerBox, VoidBox};
+use crate::boxes::MapBox;
+use crate::boxes::{IntentBox, SocketBox};
+use crate::boxes::{HTTPServerBox, HTTPRequestBox, HTTPResponseBox, DateTimeBox};
 use crate::boxes::{RandomBox, SoundBox, DebugBox};
 use crate::instance_v2::InstanceBox;
-use crate::channel_box::ChannelBox;
 use crate::interpreter::{NyashInterpreter, RuntimeError};
-use crate::interpreter::finalization;
 
 // Debug macro gated by NYASH_DEBUG=1
 macro_rules! idebug {