feat(schema): add VLAN and VXLAN schema

Add models for VLAN, VNI, VTEP, VLAN-VNI mappings, and EVPN instances.
Supports L2VNI and L3VNI types for EVPN-VXLAN fabric.

Ref: #41

schemas/vlan_vxlan.yml

@@ -0,0 +1,204 @@
+# VLAN and VXLAN Schema for EVPN-VXLAN Fabric
+# Defines VLAN, VNI mappings, and VTEP configuration
+---
+version: "1.0"
+nodes:
+  # =============================================================================
+  # VLAN
+  # =============================================================================
+  - name: VLAN
+    namespace: Infra
+    description: Virtual LAN configuration
+    label: VLAN
+    icon: mdi--lan-connect
+    default_filter: vlan_id__value
+    order_by:
+      - vlan_id__value
+    display_labels:
+      - vlan_id__value
+      - name__value
+    attributes:
+      - name: vlan_id
+        kind: Number
+        description: VLAN ID (1-4094)
+      - name: name
+        kind: Text
+        description: VLAN name
+      - name: description
+        kind: Text
+        optional: true
+      - name: status
+        kind: Dropdown
+        default_value: active
+        choices:
+          - name: active
+            label: Active
+            color: "#22c55e"
+          - name: reserved
+            label: Reserved
+            color: "#3b82f6"
+          - name: deprecated
+            label: Deprecated
+            color: "#ef4444"
+      - name: vlan_type
+        kind: Dropdown
+        default_value: standard
+        choices:
+          - name: standard
+            label: Standard
+          - name: mlag_peer
+            label: MLAG Peer
+          - name: mlag_ibgp
+            label: MLAG iBGP
+        description: VLAN purpose
+    relationships:
+      - name: vni
+        peer: InfraVNI
+        cardinality: one
+        optional: true
+        description: Associated L2VNI for VXLAN
+      - name: site
+        peer: LocationSite
+        cardinality: one
+        optional: true
+
+  # =============================================================================
+  # VNI (VXLAN Network Identifier)
+  # =============================================================================
+  - name: VNI
+    namespace: Infra
+    description: VXLAN Network Identifier
+    label: VNI
+    icon: mdi--tunnel-outline
+    default_filter: vni__value
+    order_by:
+      - vni__value
+    display_labels:
+      - vni__value
+    attributes:
+      - name: vni
+        kind: Number
+        unique: true
+        description: VNI value (1-16777215)
+      - name: description
+        kind: Text
+        optional: true
+      - name: vni_type
+        kind: Dropdown
+        default_value: l2vni
+        choices:
+          - name: l2vni
+            label: L2 VNI
+            color: "#3b82f6"
+          - name: l3vni
+            label: L3 VNI
+            color: "#22c55e"
+        description: VNI type for EVPN
+    relationships:
+      - name: vlan
+        peer: InfraVLAN
+        cardinality: one
+        optional: true
+        description: Associated VLAN for L2VNI
+      - name: vrf
+        peer: InfraVRF
+        cardinality: one
+        optional: true
+        description: Associated VRF for L3VNI
+
+  # =============================================================================
+  # VTEP (VXLAN Tunnel Endpoint)
+  # =============================================================================
+  - name: VTEP
+    namespace: Infra
+    description: VXLAN Tunnel Endpoint configuration
+    label: VTEP
+    icon: mdi--server-network-outline
+    default_filter: source_address__value
+    display_labels:
+      - device__name__value
+    attributes:
+      - name: source_address
+        kind: IPHost
+        description: VTEP source IP (typically from Loopback1)
+      - name: udp_port
+        kind: Number
+        default_value: 4789
+      - name: learn_restrict
+        kind: Dropdown
+        default_value: any
+        choices:
+          - name: any
+            label: Any
+          - name: flood
+            label: Flood
+        description: MAC learning restriction mode
+    relationships:
+      - name: device
+        peer: InfraDevice
+        cardinality: one
+        kind: Parent
+      - name: source_interface
+        peer: InfraInterfaceLoopback
+        cardinality: one
+        description: Source interface for VTEP
+      - name: vlan_vni_mappings
+        peer: InfraVlanVniMapping
+        cardinality: many
+        kind: Component
+
+  # =============================================================================
+  # VLAN to VNI Mapping (per-device)
+  # =============================================================================
+  - name: VlanVniMapping
+    namespace: Infra
+    description: VLAN to VNI mapping on a VTEP
+    label: VLAN-VNI Mapping
+    icon: mdi--swap-horizontal
+    display_labels:
+      - vlan__vlan_id__value
+      - vni__vni__value
+    relationships:
+      - name: vtep
+        peer: InfraVTEP
+        cardinality: one
+        kind: Parent
+      - name: vlan
+        peer: InfraVLAN
+        cardinality: one
+      - name: vni
+        peer: InfraVNI
+        cardinality: one
+
+  # =============================================================================
+  # EVPN Instance (per VLAN)
+  # =============================================================================
+  - name: EVPNInstance
+    namespace: Infra
+    description: EVPN instance configuration (route targets for L2 extension)
+    label: EVPN Instance
+    icon: mdi--cloud-sync
+    default_filter: vlan__vlan_id__value
+    display_labels:
+      - vlan__vlan_id__value
+    attributes:
+      - name: rd
+        kind: Text
+        description: "Route Distinguisher (format: ASN:VNI or IP:VNI)"
+      - name: route_target_import
+        kind: Text
+        description: "Import Route Target (format: VNI:VNI)"
+      - name: route_target_export
+        kind: Text
+        description: "Export Route Target (format: VNI:VNI)"
+      - name: redistribute_learned
+        kind: Boolean
+        default_value: true
+    relationships:
+      - name: vlan
+        peer: InfraVLAN
+        cardinality: one
+      - name: device
+        peer: InfraDevice
+        cardinality: one
+        kind: Parent