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/image-gen-intro/LoRADemo.vue

@@ -285,7 +285,7 @@
         <p>
           <span class="icon">💡</span>
           <strong>LoRA 原理：</strong>
-          LoRA 通过在原始权重矩阵旁边添加低秩矩阵来进行微调，只训练少量参数（通常 < 1%），就能实现特定风格或角色的学习。相比完整微调，LoRA 文件小、训练快、可组合使用。
+          LoRA 通过在原始权重矩阵旁边添加低秩矩阵来进行微调，只训练少量参数（通常 &lt; 1%），就能实现特定风格或角色的学习。相比完整微调，LoRA 文件小、训练快、可组合使用。
         </p>
       </div>
     </el-card>