feat(plugin-vite): support custom server host in renderer dev server URL

[erickzhao]

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Summarize your changes:

Ports #4030 by @ChenJiaH onto the next branch. Credit for the original change goes to @ChenJiaH (also credited via Co-authored-by on the commit).

Previously, the Vite plugin hardcoded the development server URL exposed to the main process (via the <NAME>_VITE_DEV_SERVER_URL define constant) to http://localhost:<port>. This prevented developers from using custom host addresses for the Vite dev server, which is useful for:

• Network debugging across different devices
• Docker container development environments
• Custom network configurations
• Remote development setups

The URL now respects a string server.host from the resolved Vite config. On top of the original PR, this port adds:

• Wildcard hosts (true, '0.0.0.0', '::') are normalized to localhost, since the main process runs on the same machine and wildcard addresses are not reliably loadable in Chromium (http://:::5173 is not even a valid URL).
• IPv6 literal hosts are wrapped in brackets to form valid URLs.
• Test coverage in vite.base.config.spec.ts for both a custom string host and the wildcard fallback.

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