Add link click redirect endpoint (/go/:id) for JS-free analytics

[Manak-hash]

Problem

Currently links are direct <a href> tags. Click tracking happens client-side via /api/track — if a visitor has JS disabled, clicks aren't counted.

Proposed solution

Add a /go/:linkId server-side redirect endpoint:

1. Receives click request
2. Records the click server-side (no client JS needed)
3. 302-redirects to the target URL

Make this configurable in settings:

• Direct mode (current): links point to real URLs, tracked client-side
• Redirect mode (new): links point to /go/:id, tracked server-side

Benefits

• Analytics work without client JS
• Destination URLs masked from page source
• More accurate click counting

Acceptance criteria

• /go/:linkId endpoint records click + redirects
• Setting to toggle between direct and redirect mode
• Works with all link types (url, mailto, tel, etc.)