fix: prevent frontend vendor chunk initialization crash

[WilliamWang1721]

What changed

Removed the custom Vite manualChunks vendor grouping and restored normal Rollup dependency-based chunking.

Root cause

The forced vendor-vue / vendor-misc split created a cross-chunk initialization cycle. Published 0.3.6 and 0.3.61 images fail before Vue mounts with:

ReferenceError: Cannot access 'G' before initialization

All static assets return successfully, but #app remains empty.

Validation

• Reproduced the identical browser exception in both GHCR 0.3.6 and 0.3.61 images.
• Built a complete production image from this branch successfully.
• Confirmed the fixed build renders the login page and completes login navigation without the original initialization exception.
• Temporary diagnostic workflow was removed; the final diff contains only frontend/vite.config.ts.

Release impact

This is the required frontend fix for the upcoming 0.3.62 release. Versioning and release actions remain separate.

[github-actions]

Thank you for your contribution! Before we can merge this PR, we need you to sign our Contributor License Agreement (CLA).

To sign, please reply with the following comment:

I have read the CLA Document and I hereby sign the CLA

You only need to sign once — it will be valid for all your future contributions to this project.

---

I have read the CLA Document and I hereby sign the CLA

---

_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}