Template hostapd interface/SSIDs/5GHz radio lines; guard against other-host hardcodes

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KqhjP7nud5gdBg25zCiRk9

hosts/van.conf

@@ -1,8 +1,8 @@
 # hosts/van.conf — FriendlyElec NanoPi R5C, hostname "van" (Armbian).
 # /etc/vanlink.conf -> this file. See hosts/vanlink.conf.example for the variable list.
 
-WIFI_5G_IFACE=wlp1s0            # MediaTek MT7925E (PCIe); also carries the 2.4GHz AP
-WIFI_2G_IFACE=wlx3c3332002066
+WIFI_5G_IFACE=wlp1s0            # MediaTek MT7925E (PCIe); 2.4GHz AP is the separate USB dongle below
+WIFI_2G_IFACE=wlx3c3332002066   # D-Link USB dongle
 LAN_IFACE=enP1p17s0
 STARLINK_IFACE=enP2p33s0
 WIFI_WAN_IFACE=wlan0            # not present on this host (kept for the failover config)
@@ -16,6 +16,11 @@ DHCP_RANGE_END="10.42.1.254"
 DNS_RESOLVERS="1.1.1.1 8.8.8.8"
 
 MODEM_USB_VENDOR=2c7c
+
+AP_SSID_5G=VanLink2
+AP_SSID_2G=VanLink2-2G
+# MT7925E: no 80MHz width lines, no ieee80211h
+AP_5G_RADIO='ht_capab=[HT20][SHORT-GI-20][HT40+][HT40-]\nvht_capab=[MAX-MPDU-11454][RXLDPC][SHORT-GI-80][TX-STBC-2BY1][RX-STBC-1][SU-BEAMFORMEE]\nhe_su_beamformee=1\nhe_mu_edca_qos_info_param_count=0'
 NVME_DEVICE=
 NVME_FS_DEVICE=