fix: feat: basic analytics funnel tracking for launch readiness (#1101)

Add self-hosted Umami analytics to replace the third-party cloud.umami.is
tracker. Creates @harb/analytics package with typed event helpers and
instruments the conversion funnel: CTA clicks (landing), wallet connect,
swap initiated, and stake created (web-app).

- Add Umami Docker service sharing existing postgres (separate DB)
- Add Caddy /analytics route to proxy Umami dashboard
- Configure via VITE_UMAMI_URL and VITE_UMAMI_WEBSITE_ID env vars
- Document setup and funnel events in docs/ENVIRONMENT.md

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web-app/package.json

@@ -33,6 +33,7 @@
     "vue-router": "^4.2.5",
     "vue-tippy": "^6.6.0",
     "vue-toastification": "^2.0.0-rc.5",
+    "@harb/analytics": "*",
     "@harb/web3": "*",
     "@harb/utils": "*"
   },