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/flashcards.js

@@ -0,0 +1,21 @@
+const express = require('express');
+const router  = express.Router();
+const fc      = require('../controllers/flashcardController');
+const { authMiddleware } = require('../middleware/auth');
+
+router.use(authMiddleware);
+
+router.get   ('/decks',                fc.listDecks);
+router.post  ('/decks',                fc.createDeck);
+router.put   ('/decks/:id',            fc.updateDeck);
+router.delete('/decks/:id',            fc.deleteDeck);
+router.get   ('/decks/:id/cards',      fc.getCards);
+router.post  ('/decks/:id/cards',      fc.addCard);
+router.post  ('/decks/:id/cards/bulk', fc.addCardsBulk);
+router.get   ('/decks/:id/study',      fc.getStudySession);
+router.put   ('/cards/:id',            fc.updateCard);
+router.delete('/cards/:id',            fc.deleteCard);
+router.post  ('/cards/:id/review',     fc.submitReview);
+router.get   ('/stats',                fc.getStats);
+
+module.exports = router;