refactor(configs): migrate management interface to Management0

This commit updates the management interface configuration across all leaf and spine switches to align with the target environment requirements.

Changes include:
- Changing the primary management interface from `Management1` to `Management0`.
- Removing the `vrf mgmt` assignment, moving the interface to the default global routing table.
- Explicitly configuring `lldp management-address Management0` to ensure the correct management IP is advertised to neighbors.

configs/spine1.cfg

@@ -3,6 +3,9 @@
 !
 hostname spine1
 !
+! LLDP Management0
+lldp management-address Management0
+!
 ! enable gNMI API
 management api gnmi
    transport grpc default
@@ -21,8 +24,7 @@ ip routing
 service routing protocols model multi-agent
 !
 ! Management interface
-interface Management1
-   vrf mgmt
+interface Management0
    ip address 172.16.0.1/24
 !
 ! Loopback for BGP Router-ID