Add IPAM foundation objects and schemas

Add device model, supernet prefixes, and ASN number pool for IPAM
foundation
Add IP prefix and address schemas with resource manager support
Add device model schema with port specifications
Add site IP prefix relationships and fabric device model relationships

infrahub/schemas/ipam.yml

@@ -0,0 +1,29 @@
+# IPAM Schema for EVPN-VXLAN Fabric
+# IP Prefix and Address types inheriting from Infrahub builtins
+# to enable the resource manager
+---
+version: "1.0"
+nodes:
+  # ================================================================
+  # IP Prefix (inherits BuiltinIPPrefix for resource manager support)
+  # ================================================================
+  - name: IPPrefix
+    namespace: Ipam
+    inherit_from:
+      - "BuiltinIPPrefix"
+    description: "IP Prefix for hierarchical IPAM (supernets, site prefixes, pool parents)"
+    label: IP Prefix
+    icon: mdi--ip-network-outline
+    include_in_menu: false
+
+  # ================================================================
+  # IP Address (inherits BuiltinIPAddress for resource manager support)
+  # ================================================================
+  - name: IPAddress
+    namespace: Ipam
+    inherit_from:
+      - "BuiltinIPAddress"
+    description: "IP Address managed by resource pools"
+    label: IP Address
+    icon: mdi--ip-network
+    include_in_menu: false