chore: add environment validation script and npm validate:env command

gsecure/package.json

@@ -6,7 +6,8 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "validate:env": "node scripts/validate-env.js"
   },
   "dependencies": {
     "axios": "^1.13.2",

gsecure/scripts/validate-env.js

@@ -0,0 +1,42 @@
+const fs = require('fs');
+const path = require('path');
+
+const examplePath = path.join(__dirname, '..', '.env.local.example');
+const envPath = path.join(__dirname, '..', '.env.local');
+
+if (!fs.existsSync(examplePath)) {
+  console.error('Missing .env.local.example in the gsecure directory.');
+  process.exit(1);
+}
+
+const exampleContent = fs.readFileSync(examplePath, 'utf8');
+const exampleKeys = exampleContent
+  .split(/\r?\n/)
+  .map((line) => line.trim())
+  .filter((line) => line && !line.startsWith('#'))
+  .map((line) => line.split('=')[0].trim());
+
+if (!fs.existsSync(envPath)) {
+  console.error('Missing .env.local. Please copy .env.local.example to .env.local and fill the required values.');
+  console.error('    cp .env.local.example .env.local');
+  process.exit(1);
+}
+
+const envContent = fs.readFileSync(envPath, 'utf8');
+const envKeys = envContent
+  .split(/\r?\n/)
+  .map((line) => line.trim())
+  .filter((line) => line && !line.startsWith('#'))
+  .map((line) => line.split('=')[0].trim());
+
+const missingKeys = exampleKeys.filter((key) => !envKeys.includes(key));
+
+if (missingKeys.length > 0) {
+  console.error('The following required environment keys are missing in .env.local:');
+  missingKeys.forEach((key) => console.error(`  - ${key}`));
+  console.error('\nPlease update .env.local with the missing values and try again.');
+  process.exit(1);
+}
+
+console.log('✅ .env.local contains all required keys from .env.local.example');
+process.exit(0);