feat: add rsync installer for Windows users

Author: Florent242

lib/rsync-installer.sh

@@ -0,0 +1,80 @@
+#!/usr/bin/env bash
+#
+# rsync-installer.sh - Rsync installer for Windows
+#
+# Ensures rsync is available on Windows systems by installing it via Git for Windows
+#
+
+# Check if rsync is available
+has_rsync() {
+    command -v rsync &> /dev/null
+}
+
+# Check if Git for Windows is installed
+has_git_for_windows() {
+    command -v git &> /dev/null && [[ "$OSTYPE" == "msys" || "$OSTYPE" == "cygwin" ]]
+}
+
+# Install rsync on Windows
+install_rsync_windows() {
+    info "Checking rsync availability on Windows..."
+    
+    if has_rsync; then
+        success "rsync is already available ($(rsync --version | head -n1))"
+        return 0
+    fi
+    
+    warn "rsync is not installed on your system"
+    
+    # Check if Git for Windows is available
+    if has_git_for_windows; then
+        info "Git for Windows is installed but rsync is missing"
+        info "rsync should be included in Git for Windows by default"
+        warn "Try running this command from Git Bash instead of Command Prompt/PowerShell"
+        error "Please run ShipNode from Git Bash to access rsync"
+    fi
+    
+    # Git for Windows not found
+    warn "rsync is required for deployment"
+    echo ""
+    echo "To install rsync on Windows, you have two options:"
+    echo ""
+    echo "Option 1: Git for Windows (Recommended)"
+    echo "  1. Download from: https://git-scm.com/download/win"
+    echo "  2. Run the installer (includes rsync)"
+    echo "  3. Use Git Bash to run ShipNode"
+    echo ""
+    echo "Option 2: WSL (Windows Subsystem for Linux)"
+    echo "  1. Open PowerShell as Administrator"
+    echo "  2. Run: wsl --install"
+    echo "  3. Restart your computer"
+    echo "  4. In WSL terminal: sudo apt install rsync"
+    echo "  5. Use WSL terminal to run ShipNode"
+    echo ""
+    
+    error "Please install rsync and try again"
+}
+
+# Ensure rsync is available (cross-platform)
+ensure_rsync() {
+    # Detect OS
+    local os_info
+    IFS='|' read -r os_info _ <<< "$(detect_os)"
+    
+    # Check if rsync is available
+    if has_rsync; then
+        return 0
+    fi
+    
+    # Only attempt installation on Windows
+    if [ "$os_info" = "windows" ]; then
+        install_rsync_windows
+    else
+        # On Linux/macOS, just error with instructions
+        error "rsync is not installed. Please install it:
+  Linux:   sudo apt install rsync (Ubuntu/Debian)
+           sudo yum install rsync (RHEL/CentOS)
+           sudo dnf install rsync (Fedora)
+  macOS:   rsync is pre-installed (check if Xcode CLI tools are installed)"
+    fi
+}