refactor: CompileCtx 拆分为 LabelCtx/ScopeCtx，字面量域改用注册表入口

crates/oxide_compiler/src/counter/expr/control.rs

@@ -15,10 +15,10 @@ impl Compiler {
         ctx.alloc_reg(); // result register
         ctx.projected_pc += 1; // LOAD_VAR result <- consequent
         ctx.projected_pc += 1; // JMP to end
-        ctx.label_map.insert(else_label, ctx.projected_pc);
+        ctx.labels.label_map.insert(else_label, ctx.projected_pc);
         self.count_expression(&cond.alternate, ctx);
         ctx.projected_pc += 1; // LOAD_VAR result <- alternate
-        ctx.label_map.insert(end_label, ctx.projected_pc);
+        ctx.labels.label_map.insert(end_label, ctx.projected_pc);
     }
 
     pub(in crate::counter) fn count_sequence_expression(&self, expr: &Expression, ctx: &mut CompileCtx) {
@@ -49,7 +49,7 @@ impl Compiler {
             ctx.projected_pc += 1; // JMP_IF_FALSE, JMP_IF_TRUE, or JMP_IF_NULLISH
             if matches!(log.operator, LogicalOperator::Coalesce) {
                 ctx.projected_pc += 1; // JMP over RHS on non-nullish
-                ctx.label_map.insert(Label::TernaryElse(id), ctx.projected_pc);
+                ctx.labels.label_map.insert(Label::TernaryElse(id), ctx.projected_pc);
             }
             self.count_expression(&log.right, ctx);
             ctx.projected_pc += 1; // LOAD_VAR (overwrite)
@@ -58,7 +58,7 @@ impl Compiler {
                 LogicalOperator::Or => Label::TernaryElse(id),
                 LogicalOperator::Coalesce => Label::TernaryEnd(id),
             };
-            ctx.label_map.insert(skip_label, ctx.projected_pc);
+            ctx.labels.label_map.insert(skip_label, ctx.projected_pc);
         }
     }
 }