feat: Add Intel e1000e PCIe NIC, VirtIO-GPU 2D accelerator, CPUFreq governor, and VirtIO-Input drivers

- Implement Intel 82574L / 82567LM / I217 / I219 PCIe Gigabit NIC driver with DMA ring buffers and auto-negotiation in drivers/net/e1000e.c and include/drivers/e1000e.h
- Implement VirtIO-GPU 2D hardware graphics display adapter driver with dirty rect flushing in drivers/virtio/virtio_gpu.c and include/drivers/virtio_gpu.h
- Implement Dynamic CPU Frequency Scaling and ACPI CPPC Power Governor with performance, powersave, ondemand, conservative, and schedutil policies in drivers/power/cpufreq.c and include/drivers/cpufreq.h
- Implement VirtIO-Input para-virtualized tablet/mouse event driver in drivers/virtio/virtio_input.c and include/drivers/virtio_input.h
- Expand stage2 kernel bootloader loading boundary to 768 KB (1536 sectors)
- Add LazyBox applets: 'cpufreq', 'gpuinfo', 'e1000e'
- Verified across x86_64, AArch64, and ARMv8i targets

include/drivers/virtio_input.h

@@ -0,0 +1,22 @@
+#ifndef _DRIVERS_VIRTIO_INPUT_H
+#define _DRIVERS_VIRTIO_INPUT_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define VIRTIO_INPUT_EV_SYN 0x00
+#define VIRTIO_INPUT_EV_KEY 0x01
+#define VIRTIO_INPUT_EV_REL 0x02
+#define VIRTIO_INPUT_EV_ABS 0x03
+
+typedef struct {
+    uint16_t type;
+    uint16_t code;
+    uint32_t value;
+} __attribute__((packed)) virtio_input_event_t;
+
+void virtio_input_init(void);
+bool virtio_input_is_active(void);
+void virtio_input_dump_status(void);
+
+#endif // _DRIVERS_VIRTIO_INPUT_H