feat(tui): Support full-mesh VPC peering

[kfelternv]

nicocli's TUI can only create one VPC peering at a time. This change adds a guided two-or-more-VPC selection that previews and creates the full mesh, skips existing pairs, and reports created, skipped, and failed pairs.

Related issues

Closes #5460

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
• Remove - Removed features or deprecated functionality
• Internal - Internal changes (refactoring, tests, docs, etc.)

Breaking Changes

• This PR contains breaking changes

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No testing required (docs, internal refactor, etc.)

Focused cli/tui tests pass with race detection; revision-scoped golangci-lint is clean.

Additional Notes

The full cli/tui suite retains two pre-existing nvlink-domain selector-policy failures reproduced at the exact base commit.

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