Integrate hCaptcha and email handling into contact form

- Added hCaptcha integration for client-side validation and backend verification.
- Implemented Nodemailer for contact form submissions via email.

package.json

@@ -21,10 +21,12 @@
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3",
+    "@hcaptcha/react-hcaptcha": "^1.12.0",
     "@tailwindcss/postcss": "^4.0.17",
     "@types/aos": "^3.0.7",
     "@types/js-cookie": "^3.0.6",
     "@types/node": "^20",
+    "@types/nodemailer": "^6.4.17",
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "autoprefixer": "^10.4.21",