Exclude default Laravel directories from dev server file watcher

[natsuki-engr]

This PR adds a default server.watch.ignored configuration that excludes Laravel directories which commonly cause unnecessary full page reloads during development:

• bootstrap
• database
• storage
• tests
• vendor

Motivation

Multiple users have reported that Vite triggers unexpected page reloads when files change in directories like storage/framework/views or vendor (#324, #152, laravel/laravel#6500). @timacdonald outlined a preferred approach in laravel/laravel#6500 (comment) — handle this in the plugin with sensible defaults and an escape hatch.

Resolves #152
Related: #324, laravel/laravel#6500

Approach

• A callback-based matcher checks only the top-level directory name relative to the project root, so nested paths like public/vendor are not affected.
• If the user has explicitly configured server.watch.ignored, the plugin does not override it.
• Directories referenced in the refresh config (e.g. storage/framework/views/**) are automatically excluded from the ignore list so they remain watched.
• Only applied during serve, not build.

Added Tests

• Ignores default Laravel directories during dev server
• Does not set watch ignored during build
• Respects user's server.watch.ignored config
• Keeps refresh directories watched even if they overlap ignored defaults