docs: add proxied: false documentation for preview environments

Author: roomote

docs/roo-code-cloud/environments.mdx

@@ -14,6 +14,8 @@ keywords:
   - mise
   - Initial Path
   - Subdomain Routing
+  - Proxied Ports
+  - Direct Port Access
 ---
 
 # Preview Environments
@@ -91,6 +93,7 @@ ports:
 |-------|-------------|----------|
 | `name` | Identifier for the port (used to generate environment variables) | Yes |
 | `port` | The port number to expose | Yes |
+| `proxied` | Whether traffic goes through the auth proxy (`true` by default). Set to `false` for direct port access (see [Direct Port Access](#direct-port-access-non-proxied)) | No |
 | `initial_path` | Default path to append to the preview URL | No |
 | `subdomain` | Subdomain to set on the `Host` header when forwarding requests to the app | No |
 
@@ -113,7 +116,10 @@ The name is converted to uppercase for the environment variable (e.g., `web` bec
 
 ### Limits
 
-You can configure up to **4 named ports** per environment.
+Port limits depend on whether ports are proxied (default) or non-proxied:
+
+- **Proxied ports** (default): up to **10** per environment. These share a single internal port slot via multiplexing.
+- **Non-proxied ports** (`proxied: false`): up to **1** per environment. Each non-proxied port consumes a dedicated port slot.
 
 ### Initial Path
 
@@ -189,6 +195,35 @@ Invalid examples:
 - **Admin panels**: Serve an admin interface on `admin.localhost:3000` while the main app runs on the root domain
 - **Subdomain APIs**: Frameworks like Rails can use `api.localhost:3000` to route API requests to a separate controller namespace
 
+### Direct Port Access (Non-Proxied)
+
+By default, all ports are proxied through an authentication layer that validates requests before forwarding them to your application. Setting `proxied: false` bypasses this proxy and exposes the port directly on the sandbox domain.
+
+```yaml
+ports:
+  - name: WEB
+    port: 3000
+  - name: METRICS
+    port: 9090
+    proxied: false
+```
+
+Use `proxied: false` when you need:
+
+- **Direct socket access** for protocols that don't work well through the HTTP proxy
+- **Internal services** that handle their own authentication or don't need external access control
+
+:::warning[Warning]
+When `proxied` is `false`, the port is **completely exposed without authentication**, regardless of the `unauthenticated` setting. Only use this for ports that either handle their own security or don't serve sensitive content.
+:::
+
+The `ROO_<NAME>_HOST` environment variable for a non-proxied port points to the direct sandbox domain instead of the preview proxy URL. Your application code doesn't need to change -- just use the injected variable as usual:
+
+```typescript
+// Works the same whether the port is proxied or not
+const metricsUrl = process.env.ROO_METRICS_HOST || 'http://localhost:9090';
+```
+
 ## Using Environment Variables in Your Code
 
 Use the `ROO_<NAME>_HOST` variables instead of hardcoded URLs so your services can find each other in both preview and local environments: