Add Summit Stride 5K training tracker at /running

Node/Express backend with SQLite storage, WebAuthn passkey auth,
and React frontend built via Vite. Caddy routes /running/* via
handle_path labels on docker-compose.

apps/running/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "running-server",
+  "private": true,
+  "version": "1.0.0",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "@simplewebauthn/server": "^11.0.0",
+    "better-sqlite3": "^11.7.0",
+    "connect-sqlite3": "^0.9.15",
+    "express": "^4.21.0",
+    "express-session": "^1.18.1"
+  }
+}