feat: add screenos profile to Juniper vendor module

Phase 3 audit found screenos.yaml detection profile was not registered
in the Juniper vendor module. Added to profile_names list.

ScreenOS is Juniper's legacy firewall operating system (pre-Junos).

Coverage: 5 Juniper profiles now registered
- juniper-mss
- juniperex2500os
- junos
- junose
- screenos (newly added)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

lib/towerops/snmp/profiles/vendors/juniper.ex

@@ -13,7 +13,7 @@ defmodule Towerops.Snmp.Profiles.Vendors.Juniper do
   # Enterprise OID: 1.3.6.1.4.1.14525
 
   @impl true
-  def profile_names, do: ["juniper-mss", "juniperex2500os", "junos", "junose"]
+  def profile_names, do: ["juniper-mss", "juniperex2500os", "junos", "junose", "screenos"]
 
   @impl true
   def detect_hardware(client_opts) do

test/towerops/snmp/profiles/vendors/juniper_test.exs

@@ -18,7 +18,7 @@ defmodule Towerops.Snmp.Profiles.Vendors.JuniperTest do
 
   describe "profile_names/0" do
     test "returns expected profile names" do
-      assert Juniper.profile_names() == ["juniper-mss", "juniperex2500os", "junos", "junose"]
+      assert Juniper.profile_names() == ["juniper-mss", "juniperex2500os", "junos", "junose", "screenos"]
     end
   end