refactor: split main file into smaller modules for better maintainability

backend/services/playerManager.js

@@ -0,0 +1,34 @@
+const fs = require('fs');
+const path = require('path');
+const { v4: uuidv4 } = require('uuid');
+const { PLAYER_ID_FILE, APP_DIR } = require('../core/paths');
+
+function getOrCreatePlayerId() {
+  try {
+    if (!fs.existsSync(APP_DIR)) {
+      fs.mkdirSync(APP_DIR, { recursive: true });
+    }
+
+    if (fs.existsSync(PLAYER_ID_FILE)) {
+      const data = JSON.parse(fs.readFileSync(PLAYER_ID_FILE, 'utf8'));
+      if (data.playerId) {
+        return data.playerId;
+      }
+    }
+
+    const newPlayerId = uuidv4();
+    fs.writeFileSync(PLAYER_ID_FILE, JSON.stringify({
+      playerId: newPlayerId,
+      createdAt: new Date().toISOString()
+    }, null, 2));
+
+    return newPlayerId;
+  } catch (error) {
+    console.error('Error managing player ID:', error);
+    return uuidv4();
+  }
+}
+
+module.exports = {
+  getOrCreatePlayerId
+};