Fix database directory creation and add login/logout UI when authentication is configured

backend/src/database.js

@@ -1,9 +1,17 @@
 const sqlite3 = require('sqlite3').verbose();
 const path = require('path');
+const fs = require('fs');
 
 // Database file path
 const DB_PATH = path.join(__dirname, '../data/bible.db');
 
+// Ensure data directory exists
+const dataDir = path.dirname(DB_PATH);
+if (!fs.existsSync(dataDir)) {
+  fs.mkdirSync(dataDir, { recursive: true });
+  console.log('Created data directory:', dataDir);
+}
+
 // Initialize database
 const db = new sqlite3.Database(DB_PATH, (err) => {
   if (err) {