fix(objects): split Vlan SVIs and IPs for load ordering — refs #52

InfraInterfaceVlan references InfraVLAN objects (06-vlans-vxlan.yml),
so Vlan SVIs must load after VLANs. Similarly, Vlan IP addresses
reference Vlan SVIs.

Changes:
- Extract InfraInterfaceVlan from 04 into 07-interface-vlans.yml
- Extract Vlan SVI IPs from 05 into 08-ipam-vlans.yml
- Rename 07-bgp→09, 08-vrfs→10, 09-mlag→11
- Update .infrahub.yml with new 11-file load order

Load order: foundation → fabric → devices → interfaces (Lo/Lag/Eth)
→ ipam (Lo/Eth) → vlans-vxlan → interface-vlans → ipam-vlans
→ bgp → vrfs → mlag

objects/10-vrfs.yml

@@ -0,0 +1,62 @@
+# VRFs, Route Targets, VRF Device Assignments
+# Depends on: 02-devices, 03-interfaces, 05-vlans-vxlan (VNI 100001)
+#
+# VRF gold is used on leaf3/4 (VLAN 34) and leaf7/8 (VLAN 78 + border)
+# L3VNI 100001 for symmetric IRB
+# Route targets: import/export evpn 1:100001
+# Per-device RD: <router-id>:1
+---
+apiVersion: infrahub.app/v1
+kind: Object
+spec:
+  kind: InfraRouteTarget
+  data:
+    - target: "1:100001"
+      description: VRF gold EVPN route target
+---
+apiVersion: infrahub.app/v1
+kind: Object
+spec:
+  kind: InfraVRF
+  data:
+    - name: gold
+      description: VRF gold - L3 VXLAN with symmetric IRB
+      l3vni: ["100001"]
+      import_targets:
+        - ["1:100001"]
+      export_targets:
+        - ["1:100001"]
+---
+apiVersion: infrahub.app/v1
+kind: Object
+spec:
+  kind: InfraVRFDeviceAssignment
+  data:
+    - device: ["leaf3"]
+      vrf: ["gold"]
+      route_distinguisher: "10.0.250.13:1"
+      import_targets:
+        - ["1:100001"]
+      export_targets:
+        - ["1:100001"]
+    - device: ["leaf4"]
+      vrf: ["gold"]
+      route_distinguisher: "10.0.250.14:1"
+      import_targets:
+        - ["1:100001"]
+      export_targets:
+        - ["1:100001"]
+    - device: ["leaf7"]
+      vrf: ["gold"]
+      route_distinguisher: "10.0.250.17:1"
+      import_targets:
+        - ["1:100001"]
+      export_targets:
+        - ["1:100001"]
+    - device: ["leaf8"]
+      vrf: ["gold"]
+      route_distinguisher: "10.0.250.18:1"
+      import_targets:
+        - ["1:100001"]
+      export_targets:
+        - ["1:100001"]