network: add hub registration, Redis persistence, and federated mesh join protocol

- Change default P2P port from 7070 to 8001 in config and .env.example
- Add redis_url configuration option for hub persistence (default: redis://localhost:6379)
- Implement DNS-based hub registration/unregistration via HTTPS API endpoints
- Add Redis persistence for hub registrations with 1-hour TTL
- Add island join request/response protocol with member list and blockchain credentials
- Add GPU marketplace tracking (offers, bids, providers) in hub manager
- Add

cli/core/main.py

@@ -7,6 +7,10 @@ import click
 import os
 from pathlib import Path
 
+# Import island-specific commands
+from aitbc_cli.commands.gpu_marketplace import gpu
+from aitbc_cli.commands.exchange_island import exchange_island
+
 # Force version to 0.2.2
 __version__ = "0.2.2"
 
@@ -141,6 +145,8 @@ def cli(ctx, url, api_key, output, verbose, debug):
 # Add commands to CLI
 cli.add_command(system)
 cli.add_command(version)
+cli.add_command(gpu)
+cli.add_command(exchange_island)
 
 if __name__ == '__main__':
     cli()