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>

drivers/aic8800/aic_load_fw/aicbluetooth_cmds.c

@@ -240,7 +240,6 @@ void aicwf_set_cmd_tx(void *dev, struct lmac_msg *msg, uint len)
     struct aicwf_bus *bus = usbdev->bus_if;
     u8 *buffer = bus->cmd_buf;
     u16 index = 0;
-    int ret = 0;
 
     memset(buffer, 0, CMD_BUF_MAX);
     buffer[0] = (len+4) & 0x00ff;
@@ -262,10 +261,7 @@ void aicwf_set_cmd_tx(void *dev, struct lmac_msg *msg, uint len)
     index += 2;
     memcpy(&buffer[index], (u8 *)msg->param, msg->param_len);
 
-    ret = aicwf_bus_txmsg(bus, buffer, len + 8);
-    if (ret == -EIO) {
-        ret = aicwf_bus_txmsg(bus, buffer, len + 8);
-    }
+    aicwf_bus_txmsg(bus, buffer, len + 8);
 }
 
 static inline void *rwnx_msg_zalloc(lmac_msg_id_t const id,
@@ -336,7 +332,10 @@ static int rwnx_send_msg(struct aic_usb_dev *usbdev, const void *msg_params,
     }
 
     if(!reqcfm)
+	{
         kfree(cmd);
+		rwnx_msg_free(msg, msg_params);
+	}
 
     return ret;
 }
@@ -408,7 +407,7 @@ int rwnx_send_dbg_mem_write_req(struct aic_usb_dev *usbdev, u32 mem_addr, u32 me
 {
     struct dbg_mem_write_req *mem_write_req;
 
-//	printk("%s mem_addr:%x mem_data:%x\r\n", __func__, mem_addr, mem_data);
+	//printk("%s mem_addr:%x mem_data:%x\r\n", __func__, mem_addr, mem_data);
 
     /* Build the DBG_MEM_WRITE_REQ message */
     mem_write_req = rwnx_msg_zalloc(DBG_MEM_WRITE_REQ, TASK_DBG, DRV_TASK_ID,