feat(system): remove GUI compositor, transition to pure interactive CLI terminal

- Removed gui_server, LVGL v8.3 graphics library, and related build scripts
- Upgraded microkernel FbConsole with smooth vertical scrolling, backspace cell erasing, and ANSI clear screen handling
- Routed shell output (sys_log_debug) directly to both COM1 Serial and UEFI GOP/VGA linear monitor
- Reduced system servers to 6 pure microkernel servers (init_server, uart_driver, vfs_server, net_server, procmgr, sh)
- Reassigned Core 1 to interactive terminal (sh) and Cores 2-3 to system daemons
- Bootable ISO and raw disk images now boot straight into the crisp fullscreen terminal

Makefile

@@ -28,7 +28,6 @@ COMMON_FLAGS := -Wall -Wextra -O2 -ffreestanding -fno-stack-protector \
 
 CFLAGS   := $(COMMON_FLAGS) -std=c11
 CXXFLAGS := $(COMMON_FLAGS) -std=c++20 -fno-exceptions -fno-rtti -I$(LIB_DIR)/libipc_cpp/include
-GUI_CXXFLAGS := $(filter-out -mno-sse -mno-sse2 -mno-avx, $(CXXFLAGS)) -msse -msse2
 
 # Outputs
 KERNEL_BIN   := target/x86_64-unknown-none/release/opencore_kernel
@@ -39,15 +38,13 @@ VFS_SERVER   := $(BUILD_DIR)/vfs_server.elf
 NET_SERVER   := $(BUILD_DIR)/net_server.elf
 SH_SERVER    := $(BUILD_DIR)/sh.elf
 PROCMGR      := $(BUILD_DIR)/procmgr.elf
-GUI_SERVER   := $(BUILD_DIR)/gui_server.elf
 HELLO_APP    := $(BUILD_DIR)/hello.opc
-LVGL_LIB     := $(BUILD_DIR)/liblvgl.a
 DISK_IMG     := $(BUILD_DIR)/opencoreC.img
 
 LIBC_OBJS    := $(BUILD_DIR)/string.o $(BUILD_DIR)/syscalls.o $(BUILD_DIR)/stdlib.o
 NET_OBJS     := $(BUILD_DIR)/net.o $(BUILD_DIR)/rtl8139.o $(BUILD_DIR)/pci.o
 
-.PHONY: all kernel libc hal servers lvgl image run gui qemu clean help limine-setup
+.PHONY: all kernel libc hal servers image run qemu clean help limine-setup
 
 all: kernel libc hal servers
 	@mkdir -p $(BUILD_DIR)
@@ -55,8 +52,8 @@ all: kernel libc hal servers
 	@echo "======================================================="
 	@echo " [SUCCESS] opencoreC Build Complete!"
 	@echo " Kernel:   $(KERNEL_ELF)"
-	@echo " Servers:  $(INIT_SERVER), $(UART_DRIVER), $(VFS_SERVER), $(NET_SERVER), $(PROCMGR), $(SH_SERVER), $(GUI_SERVER)"
-	@echo " Run:      make run (Serial CLI) or make gui (LVGL Desktop Window)"
+	@echo " Servers:  $(INIT_SERVER), $(UART_DRIVER), $(VFS_SERVER), $(NET_SERVER), $(PROCMGR), $(SH_SERVER)"
+	@echo " Run:      make run (Interactive Shell Terminal)"
 	@echo "======================================================="
 
 kernel:
@@ -81,14 +78,7 @@ hal: libc
 	@$(CC) $(CFLAGS) -I$(HAL_DIR)/include -c $(HAL_DIR)/src/fb.c -o $(BUILD_DIR)/fb.o
 	@$(CC) $(CFLAGS) -I$(HAL_DIR)/include -c $(HAL_DIR)/src/rtl8139.c -o $(BUILD_DIR)/rtl8139.o
 
-lvgl: $(LVGL_LIB)
-
-$(LVGL_LIB): lib/lvgl/lv_conf.h
-	@mkdir -p $(BUILD_DIR)/lvgl
-	@echo "[CC] Compiling LVGL v8.3 Graphics Library..."
-	@python3 scripts/build_lvgl.py $(CC) "$(CFLAGS)" $(BUILD_DIR)
-
-servers: libc hal $(LVGL_LIB)
+servers: libc hal
 	@mkdir -p $(BUILD_DIR)
 	@echo "[CXX/CC] Linking Ring 3 User-space Servers..."
 	@# C++ LibIPC
@@ -117,10 +107,6 @@ servers: libc hal $(LVGL_LIB)
 	@$(CXX) $(CXXFLAGS) -c $(SERVERS_DIR)/procmgr/main.cpp -o $(BUILD_DIR)/procmgr_main.o
 	@$(LD) -T $(CONFIG_DIR)/user.ld -nostdlib -static -o $(PROCMGR) \
 		$(BUILD_DIR)/procmgr_main.o $(BUILD_DIR)/ipc.o $(LIBC_OBJS)
-	@# Desktop GUI Server (LVGL v8.3)
-	@$(CXX) $(GUI_CXXFLAGS) -Ilib/lvgl -c $(SERVERS_DIR)/gui_server/main.cpp -o $(BUILD_DIR)/gui_main.o
-	@$(LD) -T $(CONFIG_DIR)/user.ld -nostdlib -static -o $(GUI_SERVER) \
-		$(BUILD_DIR)/gui_main.o $(BUILD_DIR)/ipc.o $(NET_OBJS) $(LVGL_LIB) $(LIBC_OBJS)
 	@# Native .opc Executable Application (hello.opc)
 	@$(CC) $(CFLAGS) -c apps/hello.c -o $(BUILD_DIR)/hello.o
 	@$(LD) -T $(CONFIG_DIR)/user.ld -nostdlib -static -o $(BUILD_DIR)/hello.elf \
@@ -151,7 +137,6 @@ image: all limine-setup
 	@mcopy -i $(DISK_IMG)@@1M $(NET_SERVER)   ::/boot/
 	@mcopy -i $(DISK_IMG)@@1M $(PROCMGR)      ::/boot/
 	@mcopy -i $(DISK_IMG)@@1M $(SH_SERVER)    ::/boot/
-	@mcopy -i $(DISK_IMG)@@1M $(GUI_SERVER)   ::/boot/
 	@mcopy -i $(DISK_IMG)@@1M $(HELLO_APP)    ::/boot/
 	@# Bootloader config
 	@mcopy -i $(DISK_IMG)@@1M limine.conf ::/
@@ -166,22 +151,7 @@ image: all limine-setup
 	@$(LIMINE_DIR)/limine bios-install $(DISK_IMG) 2>&1 | grep -v "^Physical\|^Installing\|^Stage\|^Reminder"
 	@echo "[IMAGE] Done: $(DISK_IMG) (BIOS + UEFI bootable)"
 
-# Launch QEMU with Desktop GUI Window (LVGL, Framebuffer, PS/2 Mouse & Keyboard)
-gui: image
-	@echo "[QEMU] Launching opencoreC Desktop GUI (LVGL, Framebuffer, PS/2 Mouse)..."
-	@echo "[QEMU] Click inside window to grab mouse. Press Ctrl+Alt+G to release mouse."
-	$(QEMU) \
-		-M q35 \
-		-smp 4 \
-		-m 512M \
-		-vga std \
-		-netdev user,id=net0 \
-		-device rtl8139,netdev=net0 \
-		-serial mon:stdio \
-		-no-reboot \
-		-drive file=$(DISK_IMG),format=raw
-
-# Launch QEMU with serial terminal (Headless CLI mode)
+# Launch QEMU with serial terminal (Interactive CLI mode)
 run: image
 	@echo "[QEMU] Launching opencoreC (SMP 4 cores, Serial terminal, Framebuffer, RTL8139 Net)..."
 	@echo "[QEMU] Type 'help' for commands. Ctrl+A X to exit QEMU."