fix(vite): simplify shortcut console output

[Akur1a]

Summary

• remove modifier-key symbols from the Vite startup message
• preserve platform-specific Option and Alt labels
• add spaces around shortcut separators for improved terminal readability

The shortcut is now displayed as Option + Shift + D on macOS and Alt + Shift + D on other platforms.

Closes #1017

Validation

• pnpm exec eslint packages/vite/src/vite.ts
• pnpm --filter vite-plugin-vue-devtools build
• pnpm type-check
• pnpm test --run — 85 tests passed

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