Initial commit: split VNOX monorepo into VNOX-Server

Unified server binary (vnox-serverd) combining:
- Gateway (TCP, auth, channels, sessions, SQLite)
- Voice-node (UDP relay, Opus, jitter buffer)

Standalone gateway (vnox-gateway) and voice-node (vnox-voice-node) preserved as sub-crates.

dev/dev/README.md

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+# Local development configuration
+
+This directory holds the default config for running VNOX on your machine.
+
+## File: `config.toml`
+
+```toml
+[node]
+name    = "dev-node"
+address = "127.0.0.1"
+
+[gateway]
+bind            = "127.0.0.1:7600"
+max_connections = 100
+session_timeout = 600
+
+[voice]
+bind = "127.0.0.1:7700"
+
+[storage]
+data_dir    = "./dev/data"
+backend     = "sqlite"
+sqlite_path = "./dev/data/vnox.db"
+```
+
+### Sections
+
+**`[node]`**
+
+- `name` - shown to clients after connect (HELLO / session UI).
+- `address` - public node address for future federation; local dev uses loopback.
+
+**`[gateway]`**
+
+- `bind` - TCP listen address for client connections. Default dev port: `7600`.
+- `max_connections` - connection cap (not enforced in all code paths yet).
+- `session_timeout` - session lifetime in seconds; sent to clients as `expires_at`.
+
+**`[voice]`**
+
+- `bind` - UDP listen address for voice relay. Default dev port: `7700`.
+- Sent to clients as `voice_endpoint` when they join a channel.
+
+**`[storage]`**
+
+- `data_dir` - gateway data directory; stores SQLite DB and `server_identity.json`.
+- `sqlite_path` - SQLite database file for chat history and user records.
+
+## First run
+
+```sh
+mkdir -p dev/data
+
+cargo run -p vnox-gateway -- --config dev/config.toml
+cargo run -p vnox-voice-node -- --config dev/config.toml
+cargo run -p vnox-client
+```
+
+On first gateway start, `dev/data/server_identity.json` is created automatically.
+Back it up if you care about a stable server identity across reinstalls.
+
+## E2E voice test
+
+With gateway and voice-node running:
+
+```sh
+cargo run -p vnox-client --bin vnox-e2e-voice
+```
+
+This headless test connects two TCP clients, joins the `voice` channel, sends UDP packets, and verifies the voice-node relays between them. Exit code 0 means pass.
+
+## Logs
+
+Set log level via environment variable:
+
+```sh
+VNOX_LOG=debug cargo run -p vnox-gateway -- --config dev/config.toml
+```
+
+## Full reference
+
+Production-oriented options: [docs/03-server/configuration.md](../docs/03-server/configuration.md).

dev/dev/config.toml

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+[node]
+name    = "dev-node"
+address = "127.0.0.1"
+
+[gateway]
+bind                = "127.0.0.1:7600"
+max_connections     = 100
+session_timeout     = 600
+# Admin HTTP server (/health, /metrics, /version). Default 0.0.0.0:7601.
+admin_bind          = "127.0.0.1:7601"
+# Per-session chat/DM rate limit (messages per second; 0 to disable).
+message_rate_per_sec = 5
+# Burst size for the token bucket.
+message_rate_burst   = 10
+
+[voice]
+bind = "127.0.0.1:7700"
+
+[storage]
+data_dir    = "./dev/data"
+backend     = "sqlite"
+sqlite_path = "./dev/data/vnox.db"
+
+[server]
+mode = "private"