chore(seed): name MxGateway connection per site (ScadaBridge Site <X>)

Replace the generic 'MxGateway Shared' connection name with a per-site name
(site-a -> 'ScadaBridge Site A', env2 site-x -> 'ScadaBridge Site X') in both
docker/ and docker-env2/ seed scripts.

docker/seed-sites.sh

@@ -83,13 +83,16 @@ for ident in site-a site-b site-c; do
         echo "  ($ident not found — skipping MxGateway connection)"
         continue
     fi
-    echo "  $ident (id=$SITE_ID): creating 'MxGateway Shared'..."
+    # Per-site connection name (e.g. site-a -> "ScadaBridge Site A").
+    SITE_LETTER=$(printf '%s' "${ident#site-}" | tr '[:lower:]' '[:upper:]')
+    CONN_NAME="ScadaBridge Site ${SITE_LETTER}"
+    echo "  $ident (id=$SITE_ID): creating '$CONN_NAME'..."
     $CLI $URL $AUTH data-connection create \
         --site-id "$SITE_ID" \
-        --name "MxGateway Shared" \
+        --name "$CONN_NAME" \
         --protocol "MxGateway" \
         --primary-config "$MXGW_CONFIG" \
-    || echo "    (MxGateway connection may already exist on $ident)"
+    || echo "    ('$CONN_NAME' may already exist on $ident)"
 done
 
 echo ""