Fix GRUB boot configuration to resolve flashing cursor issue

- Add terminal and video output configuration in embedded GRUB config
- Load essential GRUB modules (part_gpt, fat, ext2, linux, video drivers)
- Enhance main GRUB config with proper terminal setup and multiple boot options
- Add verbose and recovery mode boot menu entries
- Remove 'quiet' parameter to show boot messages for debugging
- Add console output to both tty0 and serial console
- Include modules in grub-mkstandalone for better hardware compatibility

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

config/grub-embedded.cfg.in

@@ -1,11 +1,34 @@
 # Embedded bootstrap configuration for GRUB
 # This config tells GRUB where to find the real configuration file
 
+# Set proper terminal and video output
+terminal_input console
+terminal_output console
+
+# Load essential modules
+insmod part_gpt
+insmod fat
+insmod ext2
+insmod normal
+insmod linux
+insmod all_video
+insmod video_bochs
+insmod video_cirrus
+insmod gfxterm
+
+# Set graphics mode for better compatibility
+set gfxmode=auto
+set gfxpayload=keep
+
+# Search for ESP by label
 search --no-floppy --set=root --label @ESP_LABEL@
+
+# Try to load the main config file
 if [ -e /boot/grub/grub.cfg ]; then
     configfile /boot/grub/grub.cfg
 else
     echo "Error: Could not find /boot/grub/grub.cfg"
+    echo "Root device: $root"
     echo "Press any key to enter GRUB command line..."
     # Sleep for a very long time (interruptible by any key press)
     # This provides an effective "wait for keypress" in GRUB