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/07-interface-vlans.yml

@@ -0,0 +1,143 @@
+# VLAN SVI interfaces
+# Depends on: 03-devices, 06-vlans-vxlan (VLANs must exist)
+---
+apiVersion: infrahub.app/v1
+kind: Object
+spec:
+  kind: InfraInterfaceVlan
+  data:
+    # Vlan4090 — MLAG Peer-Link SVI (all leafs)
+    - device: ["leaf1"]
+      name: Vlan4090
+      description: MLAG Peer-Link
+      enabled: true
+      autostate: false
+      vlan: ["4090"]
+    - device: ["leaf2"]
+      name: Vlan4090
+      description: MLAG Peer-Link
+      enabled: true
+      autostate: false
+      vlan: ["4090"]
+    - device: ["leaf3"]
+      name: Vlan4090
+      description: MLAG Peer-Link
+      enabled: true
+      autostate: false
+      vlan: ["4090"]
+    - device: ["leaf4"]
+      name: Vlan4090
+      description: MLAG Peer-Link
+      enabled: true
+      autostate: false
+      vlan: ["4090"]
+    - device: ["leaf5"]
+      name: Vlan4090
+      description: MLAG Peer-Link
+      enabled: true
+      autostate: false
+      vlan: ["4090"]
+    - device: ["leaf6"]
+      name: Vlan4090
+      description: MLAG Peer-Link
+      enabled: true
+      autostate: false
+      vlan: ["4090"]
+    - device: ["leaf7"]
+      name: Vlan4090
+      description: MLAG Peer-Link
+      enabled: true
+      autostate: false
+      vlan: ["4090"]
+    - device: ["leaf8"]
+      name: Vlan4090
+      description: MLAG Peer-Link
+      enabled: true
+      autostate: false
+      vlan: ["4090"]
+    # Vlan4091 — MLAG iBGP Peering SVI (all leafs)
+    - device: ["leaf1"]
+      name: Vlan4091
+      description: MLAG iBGP Peering
+      enabled: true
+      mtu: 9214
+      vlan: ["4091"]
+    - device: ["leaf2"]
+      name: Vlan4091
+      description: MLAG iBGP Peering
+      enabled: true
+      mtu: 9214
+      vlan: ["4091"]
+    - device: ["leaf3"]
+      name: Vlan4091
+      description: MLAG iBGP Peering
+      enabled: true
+      mtu: 9214
+      vlan: ["4091"]
+    - device: ["leaf4"]
+      name: Vlan4091
+      description: MLAG iBGP Peering
+      enabled: true
+      mtu: 9214
+      vlan: ["4091"]
+    - device: ["leaf5"]
+      name: Vlan4091
+      description: MLAG iBGP Peering
+      enabled: true
+      mtu: 9214
+      vlan: ["4091"]
+    - device: ["leaf6"]
+      name: Vlan4091
+      description: MLAG iBGP Peering
+      enabled: true
+      mtu: 9214
+      vlan: ["4091"]
+    - device: ["leaf7"]
+      name: Vlan4091
+      description: MLAG iBGP Peering
+      enabled: true
+      mtu: 9214
+      vlan: ["4091"]
+    - device: ["leaf8"]
+      name: Vlan4091
+      description: MLAG iBGP Peering
+      enabled: true
+      mtu: 9214
+      vlan: ["4091"]
+    # Vlan34 — VRF gold subnet (leaf3/leaf4)
+    - device: ["leaf3"]
+      name: Vlan34
+      description: VRF gold subnet
+      enabled: true
+      virtual_router_address: "10.34.34.1"
+      vlan: ["34"]
+    - device: ["leaf4"]
+      name: Vlan34
+      description: VRF gold subnet
+      enabled: true
+      virtual_router_address: "10.34.34.1"
+      vlan: ["34"]
+    # Vlan78 — VRF gold subnet (leaf7/leaf8)
+    - device: ["leaf7"]
+      name: Vlan78
+      description: VRF gold subnet
+      enabled: true
+      virtual_router_address: "10.78.78.1"
+      vlan: ["78"]
+    - device: ["leaf8"]
+      name: Vlan78
+      description: VRF gold subnet
+      enabled: true
+      virtual_router_address: "10.78.78.1"
+      vlan: ["78"]
+    # Vlan900 — BGP border peering (leaf7/leaf8)
+    - device: ["leaf7"]
+      name: Vlan900
+      description: BGP border peering
+      enabled: true
+      vlan: ["900"]
+    - device: ["leaf8"]
+      name: Vlan900
+      description: BGP border peering
+      enabled: true
+      vlan: ["900"]