Add step_upgrade (apt / paru-yay / pacman)

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

cleanup-server

@@ -127,11 +127,50 @@ select_target() {
     done
 }
 
+# -----------------------------
+# Bước 1: Nâng cấp hệ thống theo distro
+# -----------------------------
+step_upgrade() {
+    echo "${C_TITLE}--- [System Upgrade] ---${C_RESET}"
+    local distro
+    distro=$(detect_distro)
+    case "$distro" in
+        debian)
+            echo "    Distro: Debian/Ubuntu (apt)."
+            sudo apt-get update || { echo "${C_DEL}    ✗ apt-get update thất bại.${C_RESET}"; echo ""; return; }
+            local upgradable
+            upgradable=$(apt list --upgradable 2>/dev/null | grep -c 'upgradable')
+            echo "    ${C_WARN}✗ ${upgradable} package có thể nâng cấp.${C_RESET}"
+            if confirm_yn "Upgrade + autoremove?"; then
+                sudo apt-get upgrade -y
+                sudo apt-get autoremove --purge -y
+                echo "${C_OK}    ✓ Đã nâng cấp xong.${C_RESET}"
+            fi
+            ;;
+        arch)
+            echo "    Distro: Arch (pacman)."
+            local helper=""
+            command -v paru >/dev/null 2>&1 && helper="paru"
+            [ -z "$helper" ] && command -v yay >/dev/null 2>&1 && helper="yay"
+            [ -z "$helper" ] && helper="sudo pacman"
+            echo "    Helper: $helper"
+            if confirm_yn "Chạy $helper -Syu?"; then
+                $helper -Syu
+                echo "${C_OK}    ✓ Đã nâng cấp xong.${C_RESET}"
+            fi
+            ;;
+        *)
+            echo "${C_WARN}    ⚠ Distro không hỗ trợ upgrade, bỏ qua.${C_RESET}"
+            ;;
+    esac
+    echo ""
+}
+
 # -----------------------------
 # Chạy tuần tự 6 bước (stub — các bước thêm ở Task 4-9)
 # -----------------------------
 run_all_steps() {
-    echo "    (các bước cleanup sẽ thêm ở Task 4-9)"
+    step_upgrade
 }
 
 # -----------------------------