docs: clarify docker-compose dollar sign escaping for bcrypt hashes

scripts/hash-password.js

@@ -17,5 +17,8 @@ bcrypt.hash(password, saltRounds, (err, hash) => {
     }
     console.log('Plaintext:', password);
     console.log('Bcrypt Hash:', hash);
+    console.log('\n⚠️  IMPORTANT FOR DOCKER COMPOSE:');
+    console.log('If you use this hash directly in docker-compose.yml, you MUST escape the $ signs:');
+    console.log('Docker Hash:', hash.replace(/\$/g, '$$$$'));
     console.log('\nSet this hash as your ADMIN_PASSWORD environment variable.');
 });