CI: Functional tests for named replication channels

[renecannao]

Summary

The named replication channels feature (#77, #78, #79) was merged with unit tests but no functional/integration test coverage. Multi-source replication with named channels should be validated end-to-end against a real MySQL topology.

Proposal

• Add a test-named-channels.sh functional test script
• Configure multi-source replication on one replica with named channels
• Test channel-aware API endpoints (/api/v2/channels, etc.)
• Test channel-aware failover (graceful takeover preserving other channels)
• Test discovery of multi-source replication topology

Acceptance Criteria

• Multi-source replication with named channels set up in Docker
• Channel discovery and API endpoints validated
• Channel-aware failover tested
• Test integrated into CI workflow

[coderabbitai]

🔗 Related PRs

#51 - Add functional test CI: Docker MySQL topology + ProxySQL + failover tests [merged]

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