feat(dist): add distribution packages with docs and checksums

Linux Server Package (ostp-server-linux-x64.tar.gz - 5.94 MB):
- ostp-server (9.2 MB) + oncp-master (4.8 MB)
- Automated deploy.sh script with systemd integration
- README.md with quick start guide
- systemd service units (ostp-server.service, oncp-master.service)
- Config examples (server.json, server-enrollment.json)
- SHA256SUMS for integrity verification

Windows Client Package (ostp-client-windows-x64.zip - 1.29 MB):
- ostp-client.exe (1.64 MB) - CLI client
- ostp-daemon.exe (0.53 MB) - Windows Service
- ostp-installer.exe (0.37 MB) - Setup wizard
- README.md with GUI/CLI usage guide
- SHA256SUMS.txt for integrity verification

Deploy Script Features:
- Automated PSK generation
- Systemd service installation
- Firewall configuration (ufw)
- OTP token generation (60 min)
- Network validation (10.X.0.0/16)
- Security hardening (NoNewPrivileges, ProtectSystem)

Documentation includes:
- Installation instructions
- Configuration examples
- Troubleshooting guides
- Security best practices
- API reference

dist/linux-x64/ostp-server.service

@@ -0,0 +1,28 @@
+[Unit]
+Description=OSTP VPN Server
+After=network.target
+Documentation=https://github.com/ospab/ospab.network
+
+[Service]
+Type=simple
+User=root
+WorkingDirectory=/etc/ostp
+ExecStart=/usr/local/bin/ostp-server -c /etc/ostp/server.json
+Restart=on-failure
+RestartSec=5s
+StandardOutput=append:/var/log/ostp/ostp-server.log
+StandardError=append:/var/log/ostp/ostp-server.log
+
+# Security hardening
+NoNewPrivileges=true
+PrivateTmp=true
+ProtectSystem=strict
+ProtectHome=true
+ReadWritePaths=/var/log/ostp
+
+# Resource limits
+LimitNOFILE=65536
+LimitNPROC=512
+
+[Install]
+WantedBy=multi-user.target