Add health check endpoints and environment variable configuration
New features:
- haproxy_health: System-level health check (MCP, HAProxy, config files)
- haproxy_domain_health: Domain-specific health check with server status
Environment variables support:
- MCP_HOST, MCP_PORT: MCP server binding
- HAPROXY_HOST, HAPROXY_PORT: HAProxy Runtime API connection
- HAPROXY_STATE_FILE, HAPROXY_MAP_FILE, HAPROXY_SERVERS_FILE: File paths
- HAPROXY_POOL_COUNT, HAPROXY_MAX_SLOTS: Pool configuration
- LOG_LEVEL: Logging level (DEBUG, INFO, WARNING, ERROR)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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