chore: add ES module type, health endpoint, and security docs

- Add 'type: module' to package.json to fix Node.js warnings
- Add /api/health endpoint for container health checks
- Document SMTP credential security best practices
- Remove .next build artifacts (295MB saved locally)

package.json

@@ -2,6 +2,7 @@
   "name": "w-make-com",
   "version": "0.1.0",
   "private": true,
+  "type": "module",
   "scripts": {
     "dev": "next dev",
     "build": "next build",

src/app/api/health/route.ts

@@ -0,0 +1,9 @@
+import { NextResponse } from "next/server";
+
+export async function GET() {
+  return NextResponse.json({
+    status: "ok",
+    timestamp: new Date().toISOString(),
+    service: "w-make-portfolio",
+  });
+}