p2p: bootstrap peers via DNS TXT seeds

[TheNewAutonomy]

Goal

Avoid hard-coded bootstrap IPs by resolving DNS seed records and dialing bootstrap multiaddrs.

Current implementation

Implemented in crates/catalyst-cli/src/node.rs and crates/catalyst-cli/src/config.rs:

• Config key: [network].dns_seeds = ["seed1.example.org", ...]
• TXT records (preferred) may contain:
  • multiaddrs: /ip4/x.x.x.x/tcp/30333
  • ip[:port] tokens (comma/whitespace/semicolon separated)
• Fallback: A/AAAA lookup mapped to /ip{4,6}/.../tcp/<port>
• Periodic refresh (currently ~60s) and merged into the dial list

Acceptance criteria

• A new node can join using only DNS seeds (no IPs in config)
• Seeds can change IPs without requiring node reconfig

Closing as complete (implemented + merged).

[TheNewAutonomy]

Implemented and merged. Config key is ; node resolves TXT/A/AAAA and refreshes periodically.

[TheNewAutonomy]

Follow-up: the config key is [network].dns_seeds (not bootstrap_dns_seeds).

Seeds resolve via TXT (preferred) and A/AAAA fallback, and refresh periodically.