⚡ ZapQ In‑Memory FIFO Queue Server A single‑binary Go microservice that exposes a First‑In / First‑Out message queue completely in RAM. This README explains what every endpoint does, why it works internally, and the key computer‑science principles behind each subsystem. This queue deliberately pairs a plain slice + mutex (for data integrity) with lock-free atomic counters (for hot-path metrics) to balance simplicity and high-throughput telemetry. Wrapping that lean core in HTTP/TLS, structured l...