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

ap/hostapd.conf

@@ -8,7 +8,7 @@ bridge=br0
 # stays "running" but stops serving after a USB glitch.
 ctrl_interface=/var/run/hostapd
 driver=nl80211
-ssid=VanLink2
+ssid=@AP_SSID_5G@
 country_code=CA
 ieee80211d=1
 hw_mode=a
@@ -19,10 +19,7 @@ wmm_enabled=1
 ieee80211n=1
 ieee80211ac=1
 ieee80211ax=1
-ht_capab=[HT20][SHORT-GI-20][HT40+][HT40-]
-vht_capab=[MAX-MPDU-11454][RXLDPC][SHORT-GI-80][TX-STBC-2BY1][RX-STBC-1][SU-BEAMFORMEE]
-he_su_beamformee=1
-he_mu_edca_qos_info_param_count=0
+@AP_5G_RADIO@
 auth_algs=1
 wpa=2
 wpa_passphrase=1foot11foot11