feat(bcn01-lab): assign ports 11/12 on sw01 and enable DHCP on MANAGEMENT VLAN

- Port 11 → VLAN 109 (MANAGEMENT), access, Open
- Port 12 → VLAN 110 (SERVERS), access, Open
- VLAN 109 DHCP enabled with static reserved range 10.2.55.1–10.2.55.49

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

sites/BCN01-LAB/vlans.tf

@@ -73,10 +73,12 @@ locals {
       ]
     }
     "109" = {
-      name          = "MANAGEMENT"
-      subnet        = "10.2.55.0/24"
-      appliance_ip  = "10.2.55.1"
-      dhcp_handling = "Do not respond to DHCP requests"
+      name         = "MANAGEMENT"
+      subnet       = "10.2.55.0/24"
+      appliance_ip = "10.2.55.1"
+      reserved_ip_ranges = [
+        { comment = "Static reserved", id = "static", start = "10.2.55.1", end = "10.2.55.49" }
+      ]
     }
     "110" = {
       name          = "SERVERS"