Setup API firewall

Setup API Firewall for Enhanced Security

**Description:**
We need to set up **Wallarm API Firewall** to secure our API gateway and validate requests/responses against our OpenAPI specification. The firewall should run on **Render** and enforce strict validation rules.

### **Tasks:**
- Containerize the API Firewall using **Docker**.
- Mount the **OpenAPI spec (`ec_spec.yaml`)** inside the container.
- Set up **environment variables** for API specifications, URLs, and validation rules.
- Deploy the containerized service to **Render**.
- Verify deployment by testing request validation and response enforcement.

### **Expected Outcome:**
The API Firewall should be running on Render, actively validating and blocking any non-compliant API requests/responses.