fix: resolve all ESLint errors in Vue components

Fixed 22 ESLint errors across 26 Vue component files:
- Removed TypeScript type annotations from ReadingProgress.vue (converted to JS)
- Removed unused variables, imports, and duplicate function declarations
- Fixed HTML parsing errors (invalid attribute names, unclosed tags)
- Added missing :key directives to v-for loops
- Fixed duplicate object keys (backgroundImage)
- Replaced special characters in comments to avoid parsing issues
- Fixed malformed HTML tags (v-else", 003e attributes)

All warnings were left unchanged as requested. Build now passes with 0 errors.

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

docs/.vitepress/theme/components/appendix/cloud-storage-cdn/UploadProcessDemo.vue

@@ -253,27 +253,6 @@ const resetDemo = () => {
 const uploadProgress = computed(() => {
   return Math.round((stats.value.uploadedChunks / stats.value.totalChunks) * 100)
 })
-
-// 方法
-const selectMethod = (id) => {
-  selectedMethod.value = id
-  resetDemo()
-}
-
-const simulateCacheHit = () => {
-  resetDemo()
-  currentStep.value = 4
-}
-
-const simulateCacheMiss = () => {
-  resetDemo()
-  currentStep.value = 4
-}
-
-const resetDemo = () => {
-  currentStep.value = 0
-  parallelActive.value = 0
-}
 </script>
 
 <style scoped>