feat(codespaces): .devcontainer + auto-setup & auto-run (Step 10) + rapikan README

.devcontainer/setup.sh

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+#!/usr/bin/env bash
+# Setup otomatis OPEN-ISP di GitHub Codespaces
+set -e
+cd "$(dirname "$0")/.."
+
+echo "==> [OPEN-ISP] Menyiapkan dependensi sistem…"
+sudo apt-get update -qq && sudo apt-get install -y -qq build-essential python3 >/dev/null 2>&1 || true
+
+echo "==> [OPEN-ISP] Install dependensi npm…"
+npm ci --omit=dev || npm install --omit=dev
+
+echo "==> [OPEN-ISP] Siapkan file .env…"
+[ -f .env ] || cp env-example.txt .env
+
+echo "==> [OPEN-ISP] Siapkan data demo…"
+node scripts/seed-demo.js || true
+
+echo "==> [OPEN-ISP] Selesai. Aplikasi akan dijalankan otomatis di port 3001."