Enable 5GHz AP mode with MT7925E support

Updated hostapd.conf to run 5GHz AP on channel 149 with MT7925E (mt76 driver).
Now supports full 802.11ac (VHT) and 802.11ax (WiFi 6) capabilities.

Also fixed deploy.sh rendering issue that left unsubstituted placeholders in
network configs, causing Ethernet flaps. Configs are now properly deployed.

- hw_mode=a (5GHz), channel=149
- VHT and HE (WiFi 6) capabilities enabled
- Proper bridge configuration with gateway IP 10.42.1.1/24
- DHCP range 10.42.1.10-254 verified working
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

ap/hostapd.conf

@@ -11,13 +11,18 @@ driver=nl80211
 ssid=VanLink2
 country_code=CA
 ieee80211d=1
-hw_mode=g
-channel=6
+hw_mode=a
+channel=149
 wmm_enabled=1
-# 2.4GHz only — RTL8822CE on FriendlyElec R5C does not support 5GHz AP mode
-# (firmware/driver limitation; both wlan0 and wlan1 locked to 2.4GHz)
+# 5GHz AP with MT7925E (mt76 driver) on FriendlyElec R5C
+# Supports 802.11ac (VHT) and 802.11ax (WiFi 6)
 ieee80211n=1
-ht_capab=[HT20][SHORT-GI-20]
+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
 auth_algs=1
 wpa=2
 wpa_passphrase=1foot11foot11