Add Limine bootloader support with themed styling

Phase 2: Bootloader improvements

- Add bootloader choice: systemd-boot (default) or Limine
- Configure Limine with classical theme colors:
  - Dark brown background (#1a1611)
  - Tan text (#d4c4a8)
  - Gold accents (#d4a857)
- Add Plymouth boot splash option
- Update installer to prompt for bootloader choice
- Add example-limine configuration
- Update documentation with boot options

Users can now choose between:
1. systemd-boot - Simple, reliable, well-tested (default)
2. Limine - Modern, prettier, themed to match Nomarchy

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

installer/install.sh

@@ -117,6 +117,28 @@ prompt_location() {
     echo ""
 }
 
+prompt_bootloader() {
+    echo -e "${BOLD}Bootloader${NC}"
+    echo "1) systemd-boot (default) - Simple, reliable, well-tested"
+    echo "2) Limine - Modern, prettier, themed to match Nomarchy"
+    read -rp "Choose bootloader [1/2]: " bootloader_choice
+    bootloader_choice="${bootloader_choice:-1}"
+
+    if [[ "$bootloader_choice" == "2" ]]; then
+        bootloader="limine"
+        echo -e "${CYAN}Using Limine bootloader${NC}"
+    else
+        bootloader="systemd-boot"
+        echo -e "${CYAN}Using systemd-boot${NC}"
+    fi
+
+    read -rp "Enable Plymouth boot splash? [y/N]: " plymouth
+    plymouth="${plymouth:-n}"
+    [[ "$plymouth" =~ ^[Yy] ]] && enable_plymouth="true" || enable_plymouth="false"
+
+    echo ""
+}
+
 prompt_features() {
     echo -e "${BOLD}Optional Features${NC}"
 
@@ -182,6 +204,10 @@ generate_config() {
   enablePrinting = ${enable_printing};
   enableBluetooth = true;
 
+  # Boot
+  bootloader = "${bootloader}";
+  enablePlymouth = ${enable_plymouth};
+
   # Performance (security tradeoff)
   enableMitigationsOff = ${enable_mitigations_off};
 
@@ -253,6 +279,8 @@ show_summary() {
     echo -e "Timezone:    ${CYAN}${timezone}${NC}"
     echo -e "Locale:      ${CYAN}${locale}${NC}"
     echo -e "Keyboard:    ${CYAN}${keyboard}${NC}"
+    echo -e "Bootloader:  ${CYAN}${bootloader}${NC}"
+    echo -e "Plymouth:    ${CYAN}${enable_plymouth}${NC}"
     echo -e "Syncthing:   ${CYAN}${enable_syncthing}${NC}"
     echo -e "Mullvad:     ${CYAN}${enable_mullvad}${NC}"
     echo -e "Printing:    ${CYAN}${enable_printing}${NC}"
@@ -303,6 +331,7 @@ main() {
     prompt_locale
     prompt_keyboard
     prompt_location
+    prompt_bootloader
     prompt_features
 
     show_summary