add docs, protocol, plugins, README, CHANGELOG

docs/03-server/README.md

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+# Server / Gateway
+
+A VNOX node consists of two processes:
+
+```
+gateway      — TCP, handles auth / chat / channels / permissions
+voice-node   — UDP, handles voice relay
+```
+
+Both are written in Rust. They can run on the same machine or separately.
+For most self-hosted setups, running both on one machine is fine.
+
+---
+
+## Minimum requirements
+
+| | Minimum | Recommended |
+|---|---|---|
+| CPU | 1 core | 2+ cores |
+| RAM | 256 MB | 512 MB |
+| Bandwidth | 1 Mbps up | 10 Mbps up |
+| OS | Linux x86_64 | Linux x86_64 |
+| Ports | TCP 7600, UDP 7700 | configurable |
+
+Voice bandwidth scales with concurrent speakers:
+~64 kbps per active speaker (default 64k bitrate, 20ms frames).
+
+---
+
+## Sections
+
+- [deployment.md](deployment.md) — how to install and run a node
+- [configuration.md](configuration.md) — full config.toml reference
+- [operations.md](operations.md) — metrics, logs, backup, upgrades