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>

docker-compose.yml

@@ -0,0 +1,32 @@
+version: "3.9"
+
+services:
+  app:
+    build: .
+    container_name: ls-system
+    restart: unless-stopped
+    ports:
+      - "${PORT:-3000}:3000"
+    volumes:
+      - ls-data:/app/backend/data
+      - ls-uploads:/app/backend/uploads
+      - ls-backups:/app/backups
+    environment:
+      - NODE_ENV=production
+      - PORT=3000
+      - JWT_SECRET=${JWT_SECRET:?Set JWT_SECRET in .env}
+      - JWT_EXPIRES_IN=${JWT_EXPIRES_IN:-7d}
+      - CLIENT_ORIGIN=${CLIENT_ORIGIN:-}
+      - DB_PATH=/app/backend/data/learnspace.db
+      - UPLOADS_DIR=/app/backend/uploads
+    healthcheck:
+      test: ["CMD", "wget", "-qO-", "http://localhost:3000/api/health"]
+      interval: 30s
+      timeout: 5s
+      start_period: 10s
+      retries: 3
+
+volumes:
+  ls-data:
+  ls-uploads:
+  ls-backups: