feat: update to SDK v5.0 with comprehensive kernel and device support

Sync WiFi driver, firmware, and DKMS configuration from the bluetooth
branch (which itself is radxa USB driver_fw + Linux 6.16/6.17/6.19
kernel compat). aic_btusb and Bluetooth-specific install.sh logic
are intentionally excluded from main.

Driver updates:
- Add Linux kernel 6.12-6.19 compatibility support
- Add Linux 6.16 timer_container_of and wakelock API support
- Add Debian 6.1.0-26 backport support
- Add USB device ID 368b:8d81 support
- Add AIC8800DW device support
- Add TP-Link Archer TX1U Nano support (USB_VENDOR_ID_TENDA_V2:0x0110)
- Add TENDA series device support (U2, U11, U11 PRO)
- Add AIC8800FC_CUS1-6 series support
- Add AIC8800M80_CUS0-8 series support
- Add UGREEN AIC8800D80 adapter support
- Add Mercury (TP-Link OEM) support
- Allow 1 or 3 USB interfaces (BT-disabled SKUs report 1)

New compat modules:
- aicwf_compat_8800d80n.{c,h}
- aicwf_compat_8800dln.{c,h}

Firmware:
- New: fw/aic8800/, fw/aic8800D80N/, fw/aic8800D80X2/, fw/aic8800DLN/
- Updated: fw/aic8800D80/, fw/aic8800DC/

install.sh:
- Loop over all fw/aic8800* variants instead of hard-coding aic8800D80
- Install usb_modeswitch/1111_1111 config for "Pandora" clone adapter
- Verify firmware install by counting variants

dkms.conf: pass KDIR explicitly to make for cross-kernel builds.

Excluded from this commit (BT-only, kept on bluetooth branch):
- drivers/aic8800/aic_btusb/
- modprobe/aic8800-bt.conf
- diagnose_bt.sh
- install.sh btusb auto-load / hciconfig / bluez status checks

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

fw/aic8800/aic_userconfig.txt

@@ -0,0 +1,30 @@
+# AIC USERCONFIG 2021/0911/2127
+
+# txpwr_idx
+enable=1
+dsss=9
+ofdmlowrate_2g4=10
+ofdm64qam_2g4=10
+ofdm256qam_2g4=9
+ofdm1024qam_2g4=8
+ofdmlowrate_5g=10
+ofdm64qam_5g=9
+ofdm256qam_5g=9
+ofdm1024qam_5g=8
+
+# txpwr_ofst
+ofst_enable=0
+ofst_chan_1_4=0
+ofst_chan_5_9=0
+ofst_chan_10_13=0
+ofst_chan_36_64=0
+ofst_chan_100_120=0
+ofst_chan_122_140=0
+ofst_chan_142_165=0
+
+# xtal cap
+xtal_enable=0
+xtal_cap=24
+xtal_cap_fine=31
+
+# END