Add HAProxy configuration for Prerender.io

[Lasalot]

Summary

• HAProxy configuration for routing bot/crawler traffic through Prerender.io
• Updated reqrep directive (removed in HAProxy 2.1) to http-request replace-path
• Includes ACL rules for common bots and modern AI crawlers (GPTBot, ClaudeBot, Perplexity, etc.)
• Static asset extensions excluded from prerendering

Test plan

• Verify config loads without errors: haproxy -c -f HAProxy/haproxy.cfg
• Replace YOUR_TOKEN with your Prerender.io token
• Replace http://example.com with your site URL