feat(dev-server): Allow overriding host for dev server up

[renanmedina]

Summary

• Adds configurable host option to dev:up command for devcontainer/Codespaces support
• Reads host from --host CLI option, then falls back to dev.host config (default: localhost)
• Validates host input to prevent command injection
• No short flag (-h was removed to avoid conflict with --help)

Related Issues

Closes #9

Checklist

• Tests pass (./vendor/bin/pest packages/dev-server/tests)
• Lint passes (./vendor/bin/phpcs)
• Follows code standards

[markshust]

Thanks for the contribution @renanmedina and @artmuscode! Pushed some follow-up fixes directly to the branch:

• Removed -h short flag — conflicts with the universal --help convention. Host is available via --host or dev.host config only.
• Added host input validation — prevents command injection via --host by validating against a safe character pattern.
• Added --host override test — the original PR was missing a test for the long --host flag.
• Added invalid host rejection test — covers the new validation.
• Reverted unrelated style changes — fn($e) → fn ($e) and new class() → new class () to match project standards.
• Merged latest from develop — resolved merge conflicts and ensured all tests pass.

All 129 dev-server tests pass, lint is clean.