feat(bd-ak8): Add comprehensive web server unit tests
- Add WebSocket connection tests with actual client connections
- Add broadcast() tests for single and multiple clients
- Add broadcastCollisions() tests
- Add WebSocket client lifecycle tests (disconnect, reconnect, errors)
- Add vitest setup file for frontend tests
All 53 tests pass including:
- HTTP endpoints (health, workers, events, collisions, xref)
- WebSocket functionality
- Error handling
- Server lifecycle
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude Worker <noreply@anthropic.com>
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