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

servers/sh/main.cpp

@@ -136,7 +136,7 @@ static void print_fastfetch() {
     } else {
         printf("  \033[1;34m  [=== opencoreC ===]      \033[1;34mDisplay:\033[0m 1280x800 @ 60Hz (Limine FB)\n");
     }
-    printf("  \033[1;35m      x86_64 SMP           \033[1;34mDE / WM:\033[0m LVGL v8.3 Windows/KDE Compositor\n");
+    printf("  \033[1;35m      x86_64 SMP           \033[1;34mUI:\033[0m Pure CLI Terminal (Direct VGA/GOP FB & Serial)\n");
     printf("  \033[1;35m     Ring 3 Userspace      \033[1;34mCPU:\033[0m %s (%u Cores SMP)\n",
            *cpu_brand ? cpu_brand : "x86_64 Processor",
            acpi.lapic_count > 0 ? (unsigned int)acpi.lapic_count : 4);