refactor(backend): move every route to its own module

server/src/modules/gemini/gemini.routes.js

@@ -0,0 +1,24 @@
+import express from 'express';
+import sessionManager from '../../../sessionManager.js';
+import { sessionNamesDb } from '../../../database/db.js';
+
+const router = express.Router();
+
+router.delete('/sessions/:sessionId', async (req, res) => {
+    try {
+        const { sessionId } = req.params;
+
+        if (!sessionId || typeof sessionId !== 'string' || !/^[a-zA-Z0-9_.-]{1,100}$/.test(sessionId)) {
+            return res.status(400).json({ success: false, error: 'Invalid session ID format' });
+        }
+
+        await sessionManager.deleteSession(sessionId);
+        sessionNamesDb.deleteName(sessionId, 'gemini');
+        res.json({ success: true });
+    } catch (error) {
+        console.error(`Error deleting Gemini session ${req.params.sessionId}:`, error);
+        res.status(500).json({ success: false, error: error.message });
+    }
+});
+
+export default router;