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>

containers/Caddyfile

@@ -18,5 +18,9 @@
     uri strip_prefix /api/txn
     reverse_proxy txn-bot:43069
   }
+  route /analytics* {
+    uri strip_prefix /analytics
+    reverse_proxy umami:3000
+  }
   reverse_proxy landing:5174
 }