docs: add proxy-specific README

proxy/README.md

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+# Proxy Server
+
+Deploys a secure reverse proxy with Tailscale + Nginx Proxy Manager.
+
+## Quick Start
+
+```bash
+curl -fsSL https://gitea.arnodo.fr/Damien/infra-scripts/raw/branch/main/proxy/install.sh | bash
+```
+
+## Components
+
+- **Tailscale**: Private network access (SSH, admin panel)
+- **Nginx Proxy Manager**: Public reverse proxy (HTTP/HTTPS)
+- **UFW**: Firewall (only 80/443 exposed publicly)
+- **fail2ban** + **unattended-upgrades**: Basic hardening
+
+## Environment Variables
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `PROXY_HOSTNAME` | `proxy` | Server hostname |
+| `TZ` | `Europe/Paris` | Timezone |
+
+Example:
+
+```bash
+PROXY_HOSTNAME=myproxy TZ=America/New_York curl -fsSL https://gitea.arnodo.fr/Damien/infra-scripts/raw/branch/main/proxy/install.sh | bash
+```
+
+## What it does
+
+1. Sets hostname
+2. Installs base packages (vim, fail2ban, unattended-upgrades)
+3. Installs and connects Tailscale (will prompt for authentication)
+4. Configures sysctl for exit-node capability
+5. Installs Docker
+6. Configures UFW (80/443 public, everything else via Tailscale only)
+7. Deploys Nginx Proxy Manager
+8. Exposes NPM admin panel via Tailscale serve
+
+## Post-install
+
+- Access NPM admin: `https://proxy.<your-tailnet>.ts.net`
+- Default credentials: `admin@example.com` / `changeme`
+- Optionally approve exit-node in Tailscale admin console