feat: add wireguard secure installer with modular architecture

This commit introduces a new WireGuard VPN installer with enterprise-grade security features. The installer includes:

- Zero-touch installation with automatic configuration
- Modular architecture for maintainability (separate lib files)
- Client management interface with bandwidth monitoring
- Support for multiple Linux distributions
- Secure defaults and hardened configurations

The implementation provides a complete solution for deploying WireGuard VPN servers with minimal user interaction while maintaining security best practices.

bootstrap.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+# WireGuard Secure Installer
+# Copyright (c) 2025 Muhammad Fadhila Abiyyu Faris
+# GitHub: [github.com/fadhila36/wireguard-secure-installer](https://github.com/fadhila36/wireguard-secure-installer)
+
+set -e
+
+REPO_URL="https://github.com/fadhila36/wireguard-secure-installer.git"
+INSTALL_DIR="/opt/wg-installer"
+
+echo "Bootstrapping WireGuard Secure Installer..."
+
+# Check Root
+if [ "$EUID" -ne 0 ]; then
+    echo "Error: Must be run as root."
+    exit 1
+fi
+
+# Install Git if missing
+if ! command -v git >/dev/null; then
+    echo "Installing Git..."
+    if [ -f /etc/debian_version ]; then
+        apt-get update && apt-get install -y git
+    elif [ -f /etc/redhat-release ]; then
+        dnf install -y git
+    fi
+fi
+
+# Clone or Update Repo
+if [ -d "$INSTALL_DIR" ]; then
+    echo "Updating existing installation..."
+    cd "$INSTALL_DIR"
+    git pull
+else
+    echo "Cloning repository..."
+    git clone "$REPO_URL" "$INSTALL_DIR"
+    cd "$INSTALL_DIR"
+fi
+
+# Make scripts executable
+chmod +x install.sh manage.sh lib/*.sh
+
+# Run Installer
+./install.sh