chore(core): add mixpanel track (#6202)

packages/backend/server/package.json

@@ -71,6 +71,7 @@
     "ioredis": "^5.3.2",
     "keyv": "^4.5.4",
     "lodash-es": "^4.17.21",
+    "mixpanel": "^0.18.0",
     "nanoid": "^5.0.6",
     "nest-commander": "^3.12.5",
     "nestjs-throttler-storage-redis": "^0.4.1",
@@ -102,6 +103,7 @@
     "@types/graphql-upload": "^16.0.7",
     "@types/keyv": "^4.2.0",
     "@types/lodash-es": "^4.17.12",
+    "@types/mixpanel": "^2.14.8",
     "@types/node": "^20.11.20",
     "@types/nodemailer": "^6.4.14",
     "@types/on-headers": "^1.0.3",