feat: Add password generation and testing scripts

- Add generate-password.js for Node.js password hash generation
- Add generate-password-docker.sh for Docker-based generation
- Add test-password.sh to verify password against current hash

These scripts help users generate correct bcrypt hashes for the
ADMIN_PASSWORD_HASH environment variable.

Usage:
- Generate new hash: ./scripts/generate-password-docker.sh
- Test current password: ./scripts/test-password.sh

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

scripts/test-password.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+echo "================================="
+echo "MinIO WebUI Password Tester"
+echo "================================="
+echo ""
+
+# Check if .env file exists
+if [ ! -f .env ]; then
+    echo "Error: .env file not found"
+    exit 1
+fi
+
+# Get the hash from .env
+HASH=$(grep ADMIN_PASSWORD_HASH .env | cut -d '=' -f2-)
+
+if [ -z "$HASH" ]; then
+    echo "Error: ADMIN_PASSWORD_HASH not found in .env"
+    exit 1
+fi
+
+echo "Current hash in .env: ${HASH:0:20}..."
+echo ""
+
+read -s -p "Enter password to test: " PASSWORD
+echo ""
+
+# Test the password using Node.js in Docker
+docker run --rm node:20-alpine sh -c "
+    npm install bcrypt >/dev/null 2>&1 && \
+    node -e \"
+        const bcrypt = require('bcrypt');
+        const hash = '$HASH';
+        const password = '$PASSWORD';
+        bcrypt.compare(password, hash).then(result => {
+            if (result) {
+                console.log('\n✅ Password is CORRECT!');
+            } else {
+                console.log('\n❌ Password is INCORRECT!');
+            }
+        }).catch(err => {
+            console.error('\n❌ Error:', err.message);
+        });
+    \"
+"
+
+echo ""
+echo "================================="