docs(issues): DebugBox Arc<Mutex>→RwLock変換Issue作成 + FutureBox import修正

## 📋 新規Issue作成
- phase_9_75c_debugbox_fix.md: DebugBox専用修正Issue作成
- phase_9_75c_fix_compile_errors_jp.md: 既存Issue日本語版更新

## 🔧 FutureBox import修正
- src/interpreter/mod.rs: crate::boxes::FutureBox import追加
- src/interpreter/io.rs: FutureBox import パス修正

## 🎯 現状
- Issue #92: ✅ 解決済み (FutureBox二重定義)
- PR #93: ✅ 完了 (FutureBox統一)
- 残存: 39個エラー (DebugBox未変換)

## 📊 技術詳細
- DebugBox: 11箇所の.lock() → .read()/.write()変換必要
- Clone derive: 手動実装が必要
- 他10個Box型: RwLock変換完了済み

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/interpreter/mod.rs

@@ -7,7 +7,8 @@
 
 // Import all necessary dependencies
 use crate::ast::{ASTNode, BinaryOperator, CatchClause};
-use crate::box_trait::{NyashBox, StringBox, IntegerBox, BoolBox, VoidBox, AddBox, SubtractBox, MultiplyBox, DivideBox, CompareBox, ArrayBox, FileBox, ResultBox, ErrorBox, FutureBox, BoxCore};
+use crate::box_trait::{NyashBox, StringBox, IntegerBox, BoolBox, VoidBox, AddBox, SubtractBox, MultiplyBox, DivideBox, CompareBox, ArrayBox, FileBox, ResultBox, ErrorBox, BoxCore};
+use crate::boxes::FutureBox;
 use crate::instance::InstanceBox;
 use crate::channel_box::ChannelBox;
 use crate::boxes::math_box::{MathBox, FloatBox, RangeBox};