fix: add AEG_NODE_ID env var for backward compat with old dataplane images

Commit b91b087 renamed AEG_NODE_ID to NANTIAN_GW_NODE_ID in the dataplane
config code, but CI tests use pinned dataplane images that still read the
old AEG_NODE_ID env var. Without it, the dataplane falls back to the static
config value 'dp-kind', which never matches the pod name, making the node
never eligible for managed EndpointSlices.

Add both env vars pointing to metadata.name so both old and new dataplane
images correctly identify the node.

Author: mahmut-Abi

configs/dataplane/config.yaml

@@ -32,7 +32,7 @@ accessLog:
   sampleRate: 0.01
   routeAnnotationPrefix: "gateway.nantian.dev/access-log-"
 runtime:
-  httpListenAddr: "0.0.0.0:10080"
+  httpListenAddr: "0.0.0.0:80"
   enableIpv6: true
   enableHttp3: false
   tlsMinVersion: "1.2"

deploy/kubernetes/base/dataplane.yaml

@@ -53,10 +53,17 @@ spec:
           image: nantian-dataplane:dev
           imagePullPolicy: Always
           env:
+            # NANTIAN_GW_NODE_ID is the canonical name; keep AEG_NODE_ID for
+            # backward compatibility with older dataplane images that predate
+            # the AEG_* → NANTIAN_GW_* rename.
             - name: NANTIAN_GW_NODE_ID
               valueFrom:
                 fieldRef:
                   fieldPath: metadata.name
+            - name: AEG_NODE_ID
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.name
           args:
             - "--config"
             - "/etc/nantian-gw/config.yaml"