Please address the comments from this code review:

## Overall Comments
- The sponsor list and last-updated date are duplicated in both `App.vue` and `README.md`; consider centralizing this data (e.g., in a JSON or config file) so that future updates only need to be made in one place.
- You may want to standardize the date format (e.g., `2026-03-05` or locale-aware formatting) rather than hardcoding a free-form string inside the translatable text, which will make future updates and localization easier.

## Individual Comments

### Comment 1
<location path="static/src/App.vue" line_range="266-267" />
<code_context>
   sponsorHint: {
-    en: 'The website is free, open-source, and kept simple. If you want to support the author, please scan the sponsor code with WeChat. Below are the top 10 sponsors (last updated on 2025.1.21)',
-    zh: '网站免费、开源、保持简单，如果你想支持作者，请使用微信扫描赞赏码，以下是赞赏榜的前10名赞助者（最后更新 2025.9.10）',
+    en: 'The website is free, open-source, and kept simple. If you want to support the author, please scan the sponsor code with WeChat. Below are the top 10 sponsors (last updated on 2026.3.5)',
+    zh: '网站免费、开源、保持简单，如果你想支持作者，请使用微信扫描赞赏码，以下是赞赏榜的前10名赞助者（最后更新 2026.3.5）',
   },
   no: {
</code_context>
<issue_to_address>
**suggestion:** Avoid hardcoding the 'last updated' date in localized strings to reduce maintenance overhead.

The date is duplicated in both English and Chinese strings, so it must be updated in multiple places each time sponsor data changes. Instead, derive it from a single source (e.g., a `sponsorLastUpdated` constant or sponsor data) and interpolate it into the localized strings to keep them in sync automatically.

Suggested implementation:

```
  sponsorHint: {
    en: `The website is free, open-source, and kept simple. If you want to support the author, please scan the sponsor code with WeChat. Below are the top 10 sponsors (last updated on ${sponsorLastUpdated})`,
    zh: `网站免费、开源、保持简单，如果你想支持作者，请使用微信扫描赞赏码，以下是赞赏榜的前10名赞助者（最后更新 ${sponsorLastUpdated}）`,
  },

```

To fully implement this, you also need to introduce a single source of truth for `sponsorLastUpdated`:

1. If this file uses a normal `<script>` block with `export default`:
   - Add a module-level constant near the top of the script:
     ```js
     const sponsorLastUpdated = '2026.3.5';
     ```
   - Place it just after `<script>` and before `export default { ... }`.

2. If this file uses `<script setup>`:
   - Add the same constant inside the `<script setup>` block:
     ```js
     const sponsorLastUpdated = '2026.3.5';
     ```

3. For a more robust solution, consider deriving `sponsorLastUpdated` from your sponsor data (e.g., a `lastUpdated` field on the sponsor list) instead of hardcoding `'2026.3.5'`. In that case, ensure `sponsorLastUpdated` is computed once and reused in the sponsorHint strings.
</issue_to_address>