Remove MongoDB; add PM2 scripts, CI, tests; fix PlayerTab hooks; add pm2 smoke-test

.github/workflows/ci.yml

@@ -0,0 +1,23 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+      - name: Install dependencies
+        run: npm ci
+      - name: Run tests
+        run: npm test -- --runInBand
+      - name: Build production bundle
+        run: npm run build