Improve trellis info with detailed project and site information

[retlehs]

Summary

• Show project path, Trellis version (from VERSION file), virtualenv status, and VM status
• Show per-environment site details: URL, redirects, local path, SSL, cache
• Add --json flag for machine-readable output
• Add tests for validation, default output, and JSON output

Closes #4

Example output

Project:    /path/to/example.com
Trellis:    1.25.0
Virtualenv: active
VM:         lima (running)

development
  example.com
    URL:        http://example.test
    Redirects:  www.example.test
    Local Path: ../site
    SSL:        false
    Cache:      false

production
  example.com
    URL:        https://example.com
    Redirects:  www.example.com
    Local Path: ../site
    SSL:        true
    Cache:      true

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