refactor(compiler): 拆分 oxide_emit 为独立 emit pass crate（依赖倒置）

crates/oxide_emit/src/expr/object/mod.rs

@@ -0,0 +1,15 @@
+use crate::{CompileCtx, Emitter};
+use oxide_parser::Expression;
+
+mod array;
+mod object_literal;
+
+impl Emitter {
+    pub(crate) fn emit_object_domain(&self, expr: &Expression, ctx: &mut CompileCtx) -> Result<u8, String> {
+        match expr {
+            Expression::ObjectExpression(obj) => self.emit_object_expression(obj, ctx),
+            Expression::ArrayExpression(arr) => self.emit_array_expression(arr, ctx),
+            _ => self.emit_unsupported_expression(expr, ctx),
+        }
+    }
+}