feat: add route:list CLI command

[markshust]

Summary

• Adds route:list command to marko/routing that displays all registered routes in an aligned table (METHOD, PATH, ACTION, MIDDLEWARE)
• Supports --method=GET (case-insensitive) and --path=users (substring match) filters with AND composition
• Routes sorted alphabetically by path, then method for consistent output

Test plan

• 21 tests covering table output, column alignment, sorting, filtering, empty states
• Full test suite passing (4459 tests)
• Standards enforced via post-implementation pipeline

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