UX: Add system install to menu + prompt after initial setup

Made system-wide installation more discoverable and automatic.

CHANGES:

1. Main Menu Option 7 Added:
   - New option: "Install as system command"
   - Renumbered Exit from 7 to 8
   - Updated prompt from [1-7] to [1-8]
   - Calls install_script() directly from menu

2. Post-Installation Prompt:
   - After initial target configuration completes, asks:
     "Would you like to install PBSClientTool as a system command?"
   - Shows benefit: "This will allow you to run 'sudo PBSClientTool' from anywhere."
   - Default: yes (recommended)
   - Only prompts if not already installed (checks $INSTALL_PATH)
   - Applied to both setup paths:
     - PBS client already installed (first target setup)
     - PBS client not installed (fresh install)

3. Installation Detection:
   - Checks if /usr/local/bin/PBSClientTool already exists
   - Skips prompt if already installed
   - Prevents redundant installation offers

USER EXPERIENCE:

Before:
- Users had to know about --install flag
- Manual installation required navigating to script directory
- No guidance after setup

After:
- Automatic prompt after initial setup (smart default)
- Menu option for installation anytime
- Clear explanation of benefits
- One-time setup, use anywhere

Example flow:
1. User runs: sudo ./pbs-client-installer.sh
2. Completes initial configuration wizard
3. Script shows: "First target 'default' created successfully!"
4. Script asks: "Install as system command? (yes/no) [yes]:"
5. User presses Enter (accepts default)
6. Installed to /usr/local/bin/PBSClientTool
7. User can now run: sudo PBSClientTool (from any directory)

This makes system installation the default path for new users,
improving discoverability and ease of use.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

CHANGELOG.md

@@ -130,6 +130,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - install_script() function handles installation with overwrite confirmation
   - uninstall_script() function removes command but keeps configurations
   - Command-line argument parsing before main() execution
+  - **Menu option 7: "Install as system command"** - Available in main menu
+  - **Post-installation prompt** - Automatically asks if you want to install as system command after initial setup
+  - Detects if already installed (skips prompt if /usr/local/bin/PBSClientTool exists)
 - **Automatic connection testing at startup**
   - All configured targets are automatically tested when script starts
   - Quick authentication check (5 second timeout per target)

pbs-client-installer.sh

@@ -2161,8 +2161,9 @@ main() {
                 echo "  4) Delete target"
                 echo "  5) Run backup now (select target)"
                 echo "  6) Reinstall PBS client"
-                echo "  7) Exit"
-                ACTION=$(prompt "Select option [1-7]" "7")
+                echo "  7) Install as system command"
+                echo "  8) Exit"
+                ACTION=$(prompt "Select option [1-8]" "8")
 
                 case "$ACTION" in
                     1)
@@ -2240,6 +2241,9 @@ main() {
                         log "PBS client reinstalled successfully"
                         ;;
                     7)
+                        install_script
+                        ;;
+                    8)
                         info "Exiting"
                         exit 0
                         ;;
@@ -2271,6 +2275,22 @@ main() {
 
             echo
             log "First target '$TARGET_NAME' created successfully!"
+            echo
+
+            # Offer to install as system command
+            if [ ! -f "$INSTALL_PATH" ]; then
+                echo
+                info "Would you like to install PBSClientTool as a system command?"
+                echo "This will allow you to run 'sudo PBSClientTool' from anywhere."
+                echo
+                INSTALL_CHOICE=$(prompt "Install as system command? (yes/no)" "yes")
+
+                if [ "$INSTALL_CHOICE" = "yes" ]; then
+                    echo
+                    install_script
+                fi
+            fi
+
             echo
             info "You can add more targets by running this script again."
             exit 0
@@ -2311,6 +2331,22 @@ main() {
 
         echo
         log "First target '$TARGET_NAME' created successfully!"
+        echo
+
+        # Offer to install as system command
+        if [ ! -f "$INSTALL_PATH" ]; then
+            echo
+            info "Would you like to install PBSClientTool as a system command?"
+            echo "This will allow you to run 'sudo PBSClientTool' from anywhere."
+            echo
+            INSTALL_CHOICE=$(prompt "Install as system command? (yes/no)" "yes")
+
+            if [ "$INSTALL_CHOICE" = "yes" ]; then
+                echo
+                install_script
+            fi
+        fi
+
         echo
         info "You can add more targets by running this script again."
         exit 0