introduce a stable NTL_DDK driver ABI to replace direct HAL_API and kernel-header access in drivers, add code/kernel/io_ddk.c and code/public/ntlite/ddk/ headers, change DriverEntry to take (const NTL_DDK*, NTL_DRIVER_INIT*), update kmain to build the DDK once via IoInitializeDdk/IoGetDdk and hand it to both boot and runtime drivers, downgrade code/public/ntlite/ddi/io_driver.h to a legacy I/O model header pulling from ntlite/ddk instead of kernel internals, move code/third_party/lwip into code/drivers/net/lwip/third_party, fix up lwip_sources.txt and build.c include paths to match, split build.c's single CFLAGS macro into COMMON/KERNEL/USER/BOOT/DRIVER cflags.

code/drivers/input/serial/serial.c

@@ -6,11 +6,11 @@
 #include <intrin.h>
 
 #include <ntlite/status.h>
-#include <ntlite/ddi/hal_api.h>
+#include <ntlite/ddk/ddk.h>
 #include <ntlite/ddi/input_device.h>
-#include <kernel/ke_debug.h>
-#include <kernel/ke_dpc.h>
-#include <kernel/ke_irq.h>
+#include <ntlite/ddk/debug.h>
+#include <ntlite/ddk/dpc.h>
+#include <ntlite/ddk/interrupt.h>
 
 #define SERIAL_COM1_BASE 0x3F8u
 #define SERIAL_COM1_IRQ  4u
@@ -319,8 +319,9 @@ static void SerialInitializeCom1(void) {
 }
 
 // DriverEntry registers COM1 as an input source.
-KSTATUS DriverEntry(const HAL_API* hal) {
-    (void)hal;
+KSTATUS DriverEntry(const NTL_DDK* ddk, NTL_DRIVER_INIT* init) {
+    (void)ddk;
+    (void)init;
 
     uint32_t deviceId = 0;
     KSTATUS st = KeInputRegisterDevice("serial-com1", 0, &deviceId);