feat: 优化游戏体验和系统平衡性

- 修复商店物品名称显示问题，添加堆叠物品出售数量选择
- 自动战斗状态持久化，战斗结束显示"寻找中"状态
- 战斗日志显示经验获取详情（战斗经验、武器经验）
- 技能进度条显示当前/最大经验值
- 阅读自动解锁技能并持续获得阅读经验，背包可直接阅读
- 优化训练平衡：时长60秒，经验5点/秒，耐力消耗降低
- 实现自然回复系统：基于体质回复HP/耐力，休息提供3倍加成
- 战斗和训练时不进行自然回复

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

utils/taskSystem.js

@@ -312,6 +312,9 @@ function processReadingTask(gameStore, playerStore, task, elapsedSeconds) {
 
   const readingTime = bookConfig.readingTime || 60
 
+  // 首次阅读时解锁阅读技能
+  unlockSkill(playerStore, 'reading')
+
   // 检查环境惩罚
   const location = playerStore.currentLocation
   let timeMultiplier = 1.0
@@ -322,9 +325,26 @@ function processReadingTask(gameStore, playerStore, task, elapsedSeconds) {
     timeMultiplier = 0.5 + (darkPenaltyReduce / 100) * 0.5
   }
 
+  // 阅读技能速度加成
+  const readingSkillLevel = playerStore.skills.reading?.level || 0
+  const readingSpeedBonus = playerStore.globalBonus?.readingSpeed || 1
+  timeMultiplier *= readingSpeedBonus
+
   // 计算有效进度
   const effectiveProgress = task.progress * timeMultiplier
 
+  // 给予阅读技能经验（每秒给予经验）
+  const readingExpPerSecond = 1
+  const readingExpGain = readingExpPerSecond * elapsedSeconds * timeMultiplier
+  const readingResult = addSkillExp(playerStore, 'reading', readingExpGain)
+
+  // 检查技能是否升级
+  if (readingResult.leveledUp) {
+    if (gameStore.addLog) {
+      gameStore.addLog(`阅读技能升级到了 Lv.${readingResult.newLevel}!`, 'reward')
+    }
+  }
+
   if (effectiveProgress >= readingTime) {
     // 阅读完成
     const rewards = {}
@@ -343,13 +363,13 @@ function processReadingTask(gameStore, playerStore, task, elapsedSeconds) {
 
     // 添加日志
     if (gameStore.addLog) {
-      gameStore.addLog(`读完了《${bookConfig.name}》`, 'reward')
+      gameStore.addLog(`读完了《${bookConfig.name}》，阅读经验+${Math.floor(readingExpGain * task.progress / readingTime)}`, 'reward')
     }
 
     return { completed: true, rewards }
   }
 
-  // 阅读进行中，给予少量经验
+  // 阅读进行中，给予其他技能经验
   if (bookConfig.expReward) {
     for (const [skillId, expPerSecond] of Object.entries(bookConfig.expReward)) {
       const expPerTick = (expPerSecond / readingTime) * elapsedSeconds * timeMultiplier
@@ -412,8 +432,8 @@ function processTrainingTask(gameStore, playerStore, task, elapsedSeconds) {
     return { completed: true, error: '技能不存在' }
   }
 
-  // 消耗耐力
-  const staminaCost = 2 * elapsedSeconds
+  // 消耗耐力（降低消耗）
+  const staminaCost = 1 * elapsedSeconds
   if (playerStore.currentStats.stamina < staminaCost) {
     // 耐力不足，任务结束
     return { completed: true, rewards: {} }
@@ -421,8 +441,8 @@ function processTrainingTask(gameStore, playerStore, task, elapsedSeconds) {
 
   playerStore.currentStats.stamina -= staminaCost
 
-  // 给予技能经验
-  const expPerSecond = 1
+  // 给予技能经验（提升获取速度）
+  const expPerSecond = 5  // 从1提升到5
   const expGain = expPerSecond * elapsedSeconds
 
   if (!task.accumulatedExp) {
@@ -433,6 +453,12 @@ function processTrainingTask(gameStore, playerStore, task, elapsedSeconds) {
   }
   task.accumulatedExp[skillId] += expGain
 
+  // 检查技能是否升级
+  const result = addSkillExp(playerStore, skillId, expGain)
+  if (result.leveledUp && gameStore.addLog) {
+    gameStore.addLog(`${skillConfig.name}升级到了 Lv.${result.newLevel}!`, 'reward')
+  }
+
   // 检查是否完成
   if (task.data.duration && task.progress >= task.data.duration) {
     const rewards = { [skillId]: task.accumulatedExp[skillId] || 0 }