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/shop.js

@@ -0,0 +1,177 @@
+/**
+ * 商店配置
+ * 定义不同位置商店的出售物品
+ */
+
+import { ITEM_CONFIG } from './items.js'
+
+// 商店配置
+export const SHOP_CONFIG = {
+  // 营地商店 - 基础物品
+  camp: {
+    name: '营地杂货铺',
+    owner: '老杰克',
+    icon: '🏪',
+    // 出售的物品列表
+    items: [
+      {
+        itemId: 'bread',
+        stock: 99,  // 库存，-1表示无限
+        baseStock: 99
+      },
+      {
+        itemId: 'healing_herb',
+        stock: 20,
+        baseStock: 20
+      },
+      {
+        itemId: 'old_book',
+        stock: 5,
+        baseStock: 5
+      }
+    ],
+    // 收购的物品类型
+    buyItems: ['material', 'consumable'],
+    // 收购价格倍率
+    buyRate: 0.3
+  },
+
+  // 测试市场 - 商人老张
+  market: {
+    name: '商人老张的摊位',
+    owner: '商人老张',
+    icon: '🛒',
+    items: [
+      {
+        itemId: 'bread',
+        stock: -1,
+        baseStock: -1
+      },
+      {
+        itemId: 'healing_herb',
+        stock: 50,
+        baseStock: 50
+      },
+      {
+        itemId: 'old_book',
+        stock: 10,
+        baseStock: 10
+      }
+    ],
+    buyItems: ['material', 'consumable', 'weapon', 'armor'],
+    buyRate: 0.4
+  },
+
+  // 测试黑市 - 神秘人
+  blackmarket: {
+    name: '神秘人的黑市',
+    owner: '神秘人',
+    icon: '🌑',
+    items: [
+      {
+        itemId: 'healing_herb',
+        stock: 10,
+        baseStock: 10
+      }
+    ],
+    buyItems: ['material', 'weapon'],
+    buyRate: 0.2
+  }
+}
+
+/**
+ * 获取指定位置的商店配置
+ * @param {string} locationId - 位置ID
+ * @returns {Object|null} 商店配置
+ */
+export function getShopConfig(locationId) {
+  return SHOP_CONFIG[locationId] || null
+}
+
+/**
+ * 获取商店的可售物品列表
+ * @param {string} locationId - 位置ID
+ * @returns {Array} 可售物品列表
+ */
+export function getShopItems(locationId) {
+  const shop = getShopConfig(locationId)
+  if (!shop) return []
+
+  return shop.items
+    .filter(item => item.stock === -1 || item.stock > 0)
+    .map(shopItem => {
+      const itemConfig = ITEM_CONFIG[shopItem.itemId]
+      if (!itemConfig) return null
+
+      return {
+        ...itemConfig,
+        stock: shopItem.stock,
+        baseStock: shopItem.baseStock,
+        shopItemId: shopItem.itemId
+      }
+    })
+    .filter(Boolean)
+}
+
+/**
+ * 检查物品是否可以被商店收购
+ * @param {string} locationId - 位置ID
+ * @param {Object} item - 物品对象
+ * @returns {boolean} 是否可以收购
+ */
+export function canShopBuyItem(locationId, item) {
+  const shop = getShopConfig(locationId)
+  if (!shop || !shop.buyItems) return false
+
+  // 关键道具不能出售
+  if (item.type === 'key') return false
+
+  return shop.buyItems.includes(item.type)
+}
+
+/**
+ * 计算物品的购买价格（玩家买）
+ * @param {Object} gameStore - 游戏Store
+ * @param {string} itemId - 物品ID
+ * @returns {number} 购买价格（铜币）
+ */
+export function getBuyPrice(gameStore, itemId) {
+  const item = ITEM_CONFIG[itemId]
+  if (!item || !item.baseValue) return 0
+
+  const marketData = gameStore.marketPrices?.prices?.[itemId]
+  const basePrice = item.baseValue
+
+  if (marketData) {
+    return Math.floor(basePrice * marketData.buyRate)
+  }
+
+  return Math.floor(basePrice * 2)
+}
+
+/**
+ * 计算物品的出售价格（玩家卖）
+ * @param {Object} gameStore - 游戏Store
+ * @param {string} itemId - 物品ID
+ * @param {number} quality - 物品品质
+ * @returns {number} 出售价格（铜币）
+ */
+export function getSellPrice(gameStore, itemId, quality = 100) {
+  const item = ITEM_CONFIG[itemId]
+  if (!item || !item.baseValue) return 0
+
+  const marketData = gameStore.marketPrices?.prices?.[itemId]
+  const basePrice = item.baseValue
+
+  // 品质影响价格
+  const qualityMultiplier = quality / 100
+  let price = Math.floor(basePrice * qualityMultiplier)
+
+  if (marketData) {
+    price = Math.floor(price * marketData.sellRate)
+  } else {
+    price = Math.floor(price * 0.3)
+  }
+
+  return Math.max(1, price)
+}