Add PostHog analytics and enforce resume plan quotas

Author: olyaiy

.env.example

@@ -43,3 +43,9 @@ REDIS_URL=redis://localhost:6379
 # STRIPE_WEBHOOK_SECRET=whsec_...
 # NEXT_PUBLIC_STRIPE_PUBLISHABLE_KEY=pk_test_...
 # NEXT_PUBLIC_STRIPE_PRO_PRICE_ID=price_...
+
+# ===========================================
+# POSTHOG (Optional - Product Analytics)
+# ===========================================
+# NEXT_PUBLIC_POSTHOG_KEY=phc_...
+# NEXT_PUBLIC_POSTHOG_HOST=https://us.i.posthog.com

package.json

@@ -84,6 +84,7 @@
     "pdf-parse": "^1.1.1",
     "pdf.js-extract": "^0.2.1",
     "pdfjs-dist": "4.8.69",
+    "posthog-js": "^1.345.5",
     "react": "^19.0.0",
     "react-circular-progressbar": "^2.1.0",
     "react-dom": "^19.0.0",