build(infrahub): update file paths to match new directory structure

Refactor the .infrahub.yml configuration file to prefix all schema, menu, and object paths with the 'infrahub/' directory. This change aligns the configuration with the reorganized project structure where Infrahub resources have been moved into a dedicated subfolder.

infrahub/objects/02-fabric.yml

@@ -0,0 +1,15 @@
+# Fabric definition — depends on LocationSite and InfraAutonomousSystem from 01-foundation
+---
+apiVersion: infrahub.app/v1
+kind: Object
+spec:
+  kind: InfraFabric
+  data:
+    - name: evpn-lab
+      description: Arista EVPN-VXLAN reference fabric
+      underlay_protocol: ebgp
+      overlay_protocol: evpn
+      anycast_gateway_mac: "c001.cafe.babe"
+      spine_asn: ["65000"]
+      sites:
+        - ["dc1"]