[ BigBrotr/bigbrotr ] feat(seeder): Add to_validate parameter to control seeding mode
Add SeedConfig.to_validate parameter to control whether seed relays:
- to_validate=True (default): Add as validation candidates
- to_validate=False: Insert directly into relays table (trusted mode)
Split seed logic into _seed_as_candidates() and _seed_as_relays() for clarity.
When seeding directly as relays, also removes URLs from validation candidates.

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feat(seeder): Add to_validate parameter to control seeding mode ยท BigBrotr/bigbrotr@3a1ba4d
Add SeedConfig.to_validate parameter to control whether seed relays:
- to_validate=True (default): Add as validation candidates
- to_validate=False...