feat(schema,objects): add local_identifier to BGP types for unique HFID — refs #52

Infrahub does not support relation traversal in HFID computation.
Add a local_identifier attribute to PeerGroup, Session, and
AddressFamily that combines device name with the type-specific key.

Schema changes (bgp.yml):
- InfraBGPPeerGroup: HFID=local_identifier__value (e.g. spine1__evpn)
- InfraBGPSession: HFID=local_identifier__value (e.g. spine1__10.0.250.11)
- InfraBGPAddressFamily: HFID=local_identifier__value (e.g. spine1__ipv4_unicast)

Object file changes:
- 09-bgp.yml: added local_identifier to 26 PeerGroup entries
- 10-bgp-sessions.yml: added local_identifier to 72 Session + 20 AF entries,
  updated 56 peer_group + 26 active_peer_groups references

schemas/bgp.yml

@@ -106,11 +106,14 @@ nodes:
     icon: mdi--account-group
     include_in_menu: false
     uniqueness_constraints:
-      - ["bgp_config", "name__value"]
+      - ["local_identifier__value"]
     human_friendly_id:
-      - name__value
+      - local_identifier__value
     display_label: "{{ name__value }}"
     attributes:
+      - name: local_identifier
+        kind: Text
+        description: "Unique identifier combining device name and peer group name (e.g. spine1__evpn)"
       - name: name
         kind: Text
         description: Peer group name (e.g., underlay, evpn)
@@ -181,11 +184,14 @@ nodes:
     icon: mdi--connection
     include_in_menu: false
     uniqueness_constraints:
-      - ["bgp_config", "peer_address__value"]
+      - ["local_identifier__value"]
     human_friendly_id:
-      - peer_address__value
+      - local_identifier__value
     display_label: "{{ peer_address__value }}"
     attributes:
+      - name: local_identifier
+        kind: Text
+        description: "Unique identifier combining device name and peer address (e.g. spine1__10.0.250.11)"
       - name: peer_address
         kind: IPHost
         description: Neighbor IP address
@@ -231,8 +237,13 @@ nodes:
     label: BGP Address Family
     icon: mdi--format-list-bulleted
     include_in_menu: false
+    human_friendly_id:
+      - local_identifier__value
     display_label: "{{ afi__value }}"
     attributes:
+      - name: local_identifier
+        kind: Text
+        description: "Unique identifier combining device name and AFI/SAFI (e.g. spine1__ipv4_unicast)"
       - name: afi
         kind: Dropdown
         choices: