LearnSpace: full-stack educational whiteboard platform

Node.js/Express backend + vanilla JS frontend.
Features: real-time collaborative whiteboard (SSE), multi-page support,
LaTeX formulas, shapes/connectors, coordinate systems, number lines,
compass, zoom/pan, Catmull-Rom pencil smoothing, ruler/protractor with
rotation & resize controls, minimap navigation overlay, auto-measurements,
multi-page thumbnails sidebar, PNG export, page templates.
Student/teacher workflows: classes, assignments, library, dashboard.
Mobile responsive. SQLite (better-sqlite3).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/routes/notifications.js

@@ -0,0 +1,13 @@
+const router = require('express').Router();
+const { authMiddleware } = require('../middleware/auth');
+const ctrl = require('../controllers/notificationController');
+
+// SSE stream — auth done inside handler via ?token param (EventSource can't set headers)
+router.get('/stream',      ctrl.stream);
+
+router.use(authMiddleware);
+router.get('/',            ctrl.list);
+router.post('/read-all',   ctrl.markAllRead);
+router.patch('/:id/read',  ctrl.markRead);
+
+module.exports = router;