feat: add custom protocol support and fix output config logic

[duowb]

🔗 Custom Repository Protocol Support

• Add protocol field to RepoConfig for HTTP/HTTPS flexibility
• Add repoType config option for custom repository providers
• Support self-hosted repositories with custom domains/ports
• Update URL generation to use dynamic protocols

Example configurations now supported:

// Self-hosted GitLab with HTTP
{
  repo: "http://192.168.1.10/unjs/changelogen.git",
  repoType: "gitlab"
}

// Self-hosted with custom port
{
  repo: "http://192.168.1.10:8888/unjs/changelogen.git", 
  repoType: "gitlab"
}

🔧 Output Configuration Fix

• Fix changelog file generation to respect config file settings
• Add --no-output flag to explicitly disable file output
• Change output type from string | boolean to string | false
• Remove requirement for --output CLI arg when already configured