J1: Privacy-preserving event tracking

[Dgetsylver]

Scope
Wire a privacy-preserving analytics tool (Plausible or self-hosted PostHog) to measure the funnel: land -> connect wallet -> deposit. No third-party tracking cookies.

Acceptance

• No identifying PII captured.
• Privacy-policy update committed.
• Respects Do Not Track.

Files
frontend/src/main.ts, landing/index.html

[Sikkra]

I can take this. I will add a cookie-free, Do-Not-Track-aware analytics wrapper for land -> connect wallet -> deposit events, avoid wallet/PII capture, and commit a privacy policy update documenting the behavior.