[scaffold] Add Matrix/Conduit deployment: deploy/matrix/PREREQUISITES.md

deploy/matrix/PREREQUISITES.md

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+# Matrix/Conduit Host Prerequisites
+
+## Target Host Specification
+
+| Resource | Minimum | Fleet Scale |
+|----------|---------|-------------|
+| CPU | 2 cores | 4+ cores |
+| RAM | 2 GB | 8 GB |
+| Storage | 20 GB SSD | 100+ GB SSD |
+
+## DNS Requirements
+
+| Type | Host | Value |
+|------|------|-------|
+| A/AAAA | matrix.example.com | Server IP |
+| SRV | _matrix._tcp | 10 5 8448 matrix.example.com |
+
+## Ports
+
+| Port | Purpose | Access |
+|------|---------|--------|
+| 443 | Client-Server API | Public |
+| 8448 | Server-Server (federation) | Public |
+| 6167 | Conduit internal | Localhost only |
+
+## Software
+
+```bash
+curl -fsSL https://get.docker.com | sh
+sudo apt install caddy
+```
+
+## Checklist
+
+- [ ] Valid domain with DNS control
+- [ ] Docker host with 4GB RAM
+- [ ] Caddy reverse proxy configured
+- [ ] Backup destination configured