TidePoolBridge - ZMQ to Redis Bridge Daemon

Subscribes to two ZMQ PUB sockets and writes data to Redis:

1. bitcoind hashblock — triggers JSON-RPC poll for network stats
   (height, difficulty, nethash) and writes to Redis hash
   chain:{chain_id}:network

2. SeaTidePool poolstats — pool stats JSON (workers, hashrate,
   shares per second) written to Redis hash
   chain:{chain_id}:poolstats

Designed to run as a standalone FreeBSD service bridging the
stratum server and API backend for TidePoolUI pool statistics.
