fix: add post-processing script to fix i18n nodeDefs array corruption (#8718)

## Summary
@lobehub/i18n-cli (GPT-4.1) converts numeric-keyed objects like {"0":
{...}, "1": {...}} into JSON arrays with null gaps, which
crashes vue-i18n path resolution. 

Add a post-processing step that converts arrays back to objects after
translation.

## Screenshots (if applicable)
before


https://github.com/user-attachments/assets/44e81790-feae-405b-b2c4-098b06a98785


after


https://github.com/user-attachments/assets/5d1bd836-c923-437a-aca0-7ebd4d8acb89
<img width="2703" height="1083" alt="image"
src="https://github.com/user-attachments/assets/370a2eb0-c46d-4901-a23a-ab3002a9660d"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8718-fix-add-post-processing-script-to-fix-i18n-nodeDefs-array-corruption-3006d73d365081dab020fea997ec4c0a)
by [Unito](https://www.unito.io)

.github/workflows/i18n-update-core.yaml

@@ -43,7 +43,7 @@ jobs:
         env:
           PLAYWRIGHT_TEST_URL: http://localhost:5173
       - name: Update translations
-        run: pnpm locale && pnpm format
+        run: pnpm locale && pnpm fix-i18n-node-defs && pnpm format
         env:
           OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
       - name: Commit updated locales

.github/workflows/i18n-update-custom-nodes.yaml

@@ -67,7 +67,7 @@ jobs:
         env:
           PLAYWRIGHT_TEST_URL: http://localhost:5173
       - name: Update translations
-        run: pnpm locale
+        run: pnpm locale && pnpm fix-i18n-node-defs
         env:
           OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
       - name: Diff base vs updated i18n

.github/workflows/i18n-update-nodes.yaml

@@ -36,7 +36,7 @@ jobs:
         env:
           PLAYWRIGHT_TEST_URL: http://localhost:5173
       - name: Update translations
-        run: pnpm locale
+        run: pnpm locale && pnpm fix-i18n-node-defs
         env:
           OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
       - name: Create Pull Request