feat: add repository filtering options to nut import

[Copilot]

Adds --skip-forks, --skip-private, --skip-internal, --skip-public, and --include-archived flags to nut import for selective repository import.

Changes

• CLI flags: Five boolean filters on the Import command for fork, private, internal, public, and archived repository types
• Default behavior: Archived repositories are now skipped by default (use --include-archived to override)
• Filtering logic: should_skip_repo() checks repository metadata (archived, fork, private, visibility fields from octocrab's Repository model)
• Code deduplication: Extracted duplicated clone logic from three match branches into process_repo() helper function (~75 lines consolidated)
• Refactoring: Created RepoFilters struct to group filter parameters and improve code maintainability

Usage

# Import only non-fork repositories from a user
nut import --user octocat --skip-forks

# Import only public repositories from an organization (excluding archived by default)
nut import --org github --skip-private --skip-internal

# Include archived repositories
nut import --user octocat --include-archived

# Combine multiple filters
nut import --user octocat --skip-forks --skip-private

Filters are applied during streaming enumeration, so skipped repositories are never cloned.

Custom agent used: Señora Nut Engineer
Software Engineering Agent

Original prompt

Implement --skip-forks, --skip-private, --skip-internal, and --skip-public options for nut import.
Maybe use the chance to deduplicate some of the github client code.
But keep it simple.
Don't write tests unless they can succeed without access to the github api, but also don't write tests that don't do much.

Custom agent used: Señora Nut Engineer
Software Engineering Agent

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[stefreak]

@copilot skip archived repos by default, but implement an option --include-archived

[Copilot]

@copilot skip archived repos by default, but implement an option --include-archived

Done in adc2839. Archived repositories are now skipped by default. Added --include-archived flag to override this behavior when needed.