feat(core): 장비 시스템 및 게임 상태 모델 확장

- Equipment 클래스를 11개 슬롯으로 확장 (원본 Main.dfm 충실)
- TaskInfo에 몬스터 정보(baseName, part) 추가
- Stats에 현재 HP/MP 필드 추가
- 히스토리 기능 구현 (plotHistory, questHistory)
- pq_logic winEquip/winStatIndex 원본 로직 개선
- 퀘스트 몬스터 처리 로직 구현
- SaveData 직렬화 확장

lib/src/features/game/game_play_screen.dart

@@ -301,7 +301,9 @@ class _GamePlayScreenState extends State<GamePlayScreen>
                   child: Text(
                     '${speed}x',
                     style: TextStyle(
-                      fontWeight: speed > 1 ? FontWeight.bold : FontWeight.normal,
+                      fontWeight: speed > 1
+                          ? FontWeight.bold
+                          : FontWeight.normal,
                       color: speed > 1
                           ? Theme.of(context).colorScheme.primary
                           : null,
@@ -468,11 +470,19 @@ class _GamePlayScreenState extends State<GamePlayScreen>
   }
 
   Widget _buildEquipmentList(GameState state) {
-    // 원본에는 11개 슬롯이 있지만, 현재 모델은 3개만 구현
+    // 원본 Main.dfm Equips ListView - 11개 슬롯
     final equipment = [
       ('Weapon', state.equipment.weapon),
       ('Shield', state.equipment.shield),
-      ('Armor', state.equipment.armor),
+      ('Helm', state.equipment.helm),
+      ('Hauberk', state.equipment.hauberk),
+      ('Brassairts', state.equipment.brassairts),
+      ('Vambraces', state.equipment.vambraces),
+      ('Gauntlets', state.equipment.gauntlets),
+      ('Gambeson', state.equipment.gambeson),
+      ('Cuisses', state.equipment.cuisses),
+      ('Greaves', state.equipment.greaves),
+      ('Sollerets', state.equipment.sollerets),
     ];
 
     return ListView.builder(