chore: setup global root .env and auto-start script

.env.example

@@ -0,0 +1,31 @@
+# ==========================================
+# NexusGuard SD-WAN - Global Configuration
+# ==========================================
+
+# 1. Database Configuration (PostgreSQL)
+DB_HOST=postgres
+DB_PORT=5432
+DB_USER=nexusguard
+DB_PASSWORD=GantiDenganPasswordDatabaseYangKuat123!
+DB_NAME=nexusguard
+
+# 2. Redis Configuration
+REDIS_ADDR=redis:6379
+
+# 3. Security & Cryptography
+# Generate menggunakan: openssl rand -hex 32
+JWT_SECRET=GantiDenganKunciRahasiaJWTUntukDashboard256Bit
+SERVER_SALT=GantiDenganKunciGaramUntukWireGuard256Bit
+
+# 4. Networking & SD-WAN
+NFTABLES_TABLE=nexusguard
+IPAM_POOL=10.8.0.0/16
+API_PORT=8080
+
+# 5. Dashboard UI (Frontend Build Configuration)
+# URL API yang akan diakses oleh web browser client
+VITE_API_BASE_URL=http://localhost:8080/api/v1
+
+# 6. General Settings
+GIN_MODE=release
+LOG_LEVEL=info

start.sh

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+#!/bin/bash
+set -e
+
+echo "======================================"
+echo " Starting NexusGuard SD-WAN Suite...  "
+echo "======================================"
+
+# Auto-create .env if it doesn't exist
+if [ ! -f .env ]; then
+    echo "[!] .env file not found."
+    if [ -f .env.example ]; then
+        echo "[+] Auto-generating .env from .env.example..."
+        cp .env.example .env
+        echo "[!] IMPORTANT: Please review the .env file and change the default passwords!"
+    else
+        echo "[-] ERROR: .env.example is missing. Cannot generate .env."
+        exit 1
+    fi
+else
+    echo "[+] .env file detected."
+fi
+
+# Make sure Docker is available
+if ! command -v docker-compose &> /dev/null; then
+    echo "[-] ERROR: docker-compose is not installed. Please install Docker first."
+    exit 1
+fi
+
+echo "[+] Bringing up Docker containers..."
+docker-compose up -d
+
+echo "======================================"
+echo " NexusGuard is successfully running!  "
+echo " API Port : 8080"
+echo "======================================"