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>

tests/helpers/timer.js

@@ -0,0 +1,64 @@
+/**
+ * 时间相关测试辅助函数
+ */
+
+import { vi } from 'vitest'
+
+/**
+ * Mock Date.now()
+ * @param {number} timestamp - 时间戳
+ * @returns {Object} spy
+ */
+export function mockDateNow(timestamp = Date.now()) {
+  return vi.spyOn(Date, 'now').mockReturnValue(timestamp)
+}
+
+/**
+ * Mock setInterval/setTimeout
+ * @returns {Object} { useFakeTimers, useRealTimers }
+ */
+export function mockTimers() {
+  return {
+    useFakeTimers: () => vi.useFakeTimers(),
+    useRealTimers: () => vi.useRealTimers(),
+    runAllTimers: () => vi.runAllTimers(),
+    runOnlyPendingTimers: () => vi.runOnlyPendingTimers(),
+    advanceTimersByTime: (ms) => vi.advanceTimersByTime(ms)
+  }
+}
+
+/**
+ * 等待指定时间
+ * @param {number} ms - 毫秒
+ * @returns {Promise}
+ */
+export function wait(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
+
+/**
+ * 快速时间（用于测试）
+ * @param {number} seconds - 秒数
+ * @returns {number} 毫秒
+ */
+export function seconds(seconds) {
+  return seconds * 1000
+}
+
+/**
+ * 快速时间（分钟）
+ * @param {number} minutes - 分钟数
+ * @returns {number} 毫秒
+ */
+export function minutes(minutes) {
+  return minutes * 60 * 1000
+}
+
+/**
+ * 快速时间（小时）
+ * @param {number} hours - 小时数
+ * @returns {number} 毫秒
+ */
+export function hours(hours) {
+  return hours * 60 * 60 * 1000
+}