perf: use manualChunks to improve chunking

[RainyNight9]

before:

after:

[Copilot]

Pull request overview

This PR implements performance optimization by configuring Vite's manualChunks option to split vendor dependencies into separate chunks, improving code splitting and caching efficiency.

• Adds manual chunk configuration for major dependencies (pixi.js, live2d, ant-design-vue, vue)
• Splits ant-design-vue into multiple chunks (core, icons, modal, message, config-provider)
• Sets chunk size warning limit to 500KB

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
vite.config.ts	Implements manual chunking strategy with vendor library separation and chunk size warning configuration
.vscode/settings.json	Adds project-specific terms to spell checker dictionary to prevent false positives

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