feat: 支持 Infinity 常量

crates/oxide_compiler/src/compiler.rs

@@ -184,6 +184,7 @@ impl CompileCtx {
         let builtins = [
             "NaN",
             "undefined",
+            "Infinity",
             "Object",
             "Array",
             "String",

crates/oxide_compiler/tests/compile_expr_tests.rs

@@ -376,3 +376,15 @@ fn compile_this_member_read_ok() {
     let module = compile_source("function f() { return this.x; }");
     assert!(!module.bytecode.is_empty());
 }
+
+#[test]
+fn compile_infinity_ok() {
+    let module = compile_source("Infinity");
+    assert!(!module.bytecode.is_empty());
+}
+
+#[test]
+fn compile_neg_infinity_ok() {
+    let module = compile_source("1 / -Infinity");
+    assert!(!module.bytecode.is_empty());
+}