refactor(PosterCheckin): 优化海报生成逻辑并添加TODO注释

移除冗余的空格并添加TODO注释说明未来需要通过ID获取海报信息
优化背景图变化时的海报重新生成逻辑

@@ -164,6 +164,8 @@ const pageParams = ref({
   id: '',
 })
 
+// TODO: 有真实数据的时候, 通过ID获取具体地点的海报信息, 赋值currentPosterIndex获取特定的海报
+
 // 图片预览相关
 const previewVisible = ref(false)
 const previewImages = ref([])
@@ -457,17 +459,17 @@ watch(backgroundImages, (newVal, oldVal) => {
   const currentIndex = currentPosterIndex.value
   const newBgImage = newVal[currentIndex]
   const oldBgImage = oldVal?.[currentIndex]
-  
+
   if (newBgImage !== oldBgImage) {
     console.log('背景图发生变化:', { currentIndex, newBgImage, oldBgImage })
-    
+
     // 标记当前海报需要重新生成
     posterGeneratedFlags.value[currentIndex] = false
     delete posterConfigHashes.value[currentIndex]
-    
+
     // 清除当前海报路径
     posterPath.value = ''
-    
+
     // 重新生成海报
     generateCurrentPoster()
   }
@@ -625,20 +627,20 @@ const uploadBackgroundImage = (filePath) => {
       const data = JSON.parse(uploadRes.data)
       if (data.code === 0 && data.data) {
         const currentIndex = currentPosterIndex.value
-        
+
         // 为当前海报设置背景图
         backgroundImages.value[currentIndex] = data.data.src
-        
+
         // 强制标记当前海报需要重新生成
         posterGeneratedFlags.value[currentIndex] = false
         delete posterConfigHashes.value[currentIndex]
-        
+
         // 清除当前海报路径，强制重新生成
         posterPath.value = ''
-        
+
         // 立即重新生成海报
         generateCurrentPoster()
-        
+
         Taro.showToast({ title: '上传成功', icon: 'success' })
       } else {
         Taro.showToast({ title: data.msg || '上传失败', icon: 'none' })
@@ -669,13 +671,13 @@ const onPosterSuccess = (result) => {
   posterConfigHashes.value[currentIndex] = generateConfigHash()
 
   shouldGeneratePoster.value = false
-  
+
   console.log('海报生成成功:', {
     currentIndex,
     posterPath: result.tempFilePath,
     hasCustomBackground: !!backgroundImages.value[currentIndex]
   })
-  
+
   Taro.showToast({ title: '海报生成成功', icon: 'success' })
 }