Initial commit: Text Adventure Game

Features:
- Combat system with AP/EP hit calculation and three-layer defense
- Auto-combat/farming mode
- Item system with stacking support
- Skill system with levels, milestones, and parent skill sync
- Shop system with dynamic pricing
- Inventory management with bulk selling
- Event system
- Game loop with offline earnings
- Save/Load system

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

config/constants.js

@@ -0,0 +1,26 @@
+// 游戏数值常量
+export const GAME_CONSTANTS = {
+  // 时间流速：现实1秒 = 游戏时间5分钟
+  TIME_SCALE: 5,
+
+  // 离线收益时间(小时)
+  OFFLINE_HOURS_BASE: 0.5,
+  OFFLINE_HOURS_AD: 2.5,
+
+  // 耐力相关
+  STAMINA_FULL_EFFECT: 50,  // 耐力高于此值时无惩罚
+  STAMINA_EMPTY_PENALTY: 0.5,  // 耐力耗尽时效率减半
+
+  // 经验倍率
+  EXP_PARTIAL_SUCCESS: 0.5,  // 部分成功时经验比例
+
+  // 品质等级
+  QUALITY_LEVELS: {
+    1: { name: '垃圾', color: '#808080', range: [0, 49], multiplier: 1.0 },
+    2: { name: '普通', color: '#ffffff', range: [50, 99], multiplier: 1.0 },
+    3: { name: '优秀', color: '#4ade80', range: [100, 129], multiplier: 1.1 },
+    4: { name: '稀有', color: '#60a5fa', range: [130, 159], multiplier: 1.3 },
+    5: { name: '史诗', color: '#a855f7', range: [160, 199], multiplier: 1.6 },
+    6: { name: '传说', color: '#f97316', range: [200, 250], multiplier: 2.0 }
+  }
+}