Add FreeRADIUS container for dynamic VLAN assignment

Add a FreeRADIUS server on the management network (172.16.0.200)
with test users mapped to existing VLANs (40, 34, 78) for future
802.1X/MAB dynamic VLAN assignment on access switches.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hosts/freeradius/authorize

@@ -0,0 +1,19 @@
+host1_user	Cleartext-Password := "host1pass"
+	Tunnel-Type = VLAN,
+	Tunnel-Medium-Type = IEEE-802,
+	Tunnel-Private-Group-Id = "40"
+
+host2_user	Cleartext-Password := "host2pass"
+	Tunnel-Type = VLAN,
+	Tunnel-Medium-Type = IEEE-802,
+	Tunnel-Private-Group-Id = "34"
+
+host3_user	Cleartext-Password := "host3pass"
+	Tunnel-Type = VLAN,
+	Tunnel-Medium-Type = IEEE-802,
+	Tunnel-Private-Group-Id = "40"
+
+host4_user	Cleartext-Password := "host4pass"
+	Tunnel-Type = VLAN,
+	Tunnel-Medium-Type = IEEE-802,
+	Tunnel-Private-Group-Id = "78"

hosts/freeradius/clients.conf

@@ -0,0 +1,5 @@
+client management_network {
+    ipaddr = 172.16.0.0/24
+    secret = arista123
+    shortname = evpn-switches
+}