test: cover resolveDockerHost (follow-up to #119)

[veksen]

Summary

• Export resolveDockerHost so it can be unit-tested directly.
• Add tests covering non-localhost passthrough, escapeDocker same-host passthrough, reachable/unreachable docker-host probes, and the onFullSync → redump integration that verifies lastSourceDb holds the resolved db. Closes Write tests for resolveDockerHost (follow-up to #119) #121.

Test plan

• npx vitest run src/remote/resolve-docker-host.test.ts (5/5 pass)
• npx vitest run (168/168 pass, no regressions)
• npx tsc --noEmit

🤖 Generated with Claude Code

[github-actions]

Query Doctor Analysis

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2 queries analyzed

2 pre-existing issues

• SELECT "guests"."id", "guests"."session_id", "guests"."username", "guests"."avatar_path", "guests"."color", "guests"."side", "guests"."audio_recording_path", "guests"."audio_recording_public", "gue...
  index assets(event_id, inserted_at desc)
  cost 31,003,449 → 1,493 (100% reduction)
• SELECT * FROM guest_ip_addresses WHERE ip_address = '127.0.0.1';
  index guest_ip_addresses(ip_address)
  cost 154,402 → 8 (100% reduction)

_{Using assumed statistics (10000000 rows/table). For better results, sync production stats.}