[docs] feat(agent): add proxy documentation (#276)

* [docs] feat(agent): add proxy documentation (#276)

* [docs] feat(agent): review pr feedbacks (#276)

Author: gabriel-peze

docs/usage/openaev-agent.md

@@ -224,6 +224,20 @@ The installation creates two firewall rules:
 
 ---
 
+## Proxy Configuration
+
+To use a proxy with the OpenAEV Agent, define both `HTTP_PROXY` and `HTTPS_PROXY` **before running the installer**.
+
+You can configure them in either of the following ways:
+- **Machine-wide (persistent):** set them as system environment variables so they are available globally.
+- **Session-only (temporary):** set/export them in the same terminal session immediately before executing the installation script.
+
+If the agent is installed as a service, make sure these variables are also available to the service account.
+
+Verify that your proxy is correctly configured and communicate well with your OpenAEV Agent installed.
+
+---
+
 ## Features
 
 The main features of the OpenAEV Agent include: