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>

usb_modeswitch/1111_1111

@@ -0,0 +1,16 @@
+# AIC8800D80 "Pandora" clone adapter (VID:PID 1111:1111)
+# Sends vendor-specific SCSI CDB to trigger mode switch from
+# USB Mass Storage to WiFi+BT mode.
+#
+# The 16-byte CDB is: FD 00 00 00 00 00 00 00 00 00 00 00 00 00 00 F2
+# Wrapped in a standard 31-byte SCSI CBW (Command Block Wrapper).
+#
+# Install as: /etc/usb_modeswitch.d/1111:1111
+# (The filename must contain a colon on Linux; this file is named
+#  1111_1111 in the repo because Windows/git can't handle colons.)
+
+DefaultVendor=0x1111
+DefaultProduct=0x1111
+TargetVendor=0xa69c
+TargetProduct=0x8d80
+MessageContent="555342438765432100000000000010fd0000000000000000000000000000f2"