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Add esp_netif_add_static_neighbor() and esp_netif_remove_static_neighbor(), gated by CONFIG_LWIP_ND6_SUPPORT_STATIC_ENTRIES. These API's let callers install/remove permanent IPv6->MAC mappings that bypass Neighbor Discovery (no NS/NA). The calls run in the TCP/IP context and wrap the underlying lwIP nd6_add_static_neighbor()/nd6_remove_static_neighbor() functions.