Updated templates to use the new field names after renaming:
- ASN.Number -> ASN.ASN in as_detail.html
- Fixed references to ASN field in prefix_detail.html for ASNInfo and ASPathEntry structs
- Change AS path from descriptions to handles (short names)
- Make each AS in the path a clickable link to /as/<asn>
- Add font-weight to AS links in path for better visibility
- Prevent word wrapping on all table columns except AS path
- Remove unused maxASDescriptionLength constant
- Display AS descriptions alongside AS numbers in format: Description (ASN)
- Truncate descriptions longer than 20 characters with ellipsis
- Increase container max width to 1600px for better display
- Enable word wrapping for AS path cells to handle long paths
- Update mobile responsive styles for AS path display
- Implement handleASDetail() and handlePrefixDetail() HTML handlers
- Create AS detail HTML template with prefix listings
- Create prefix detail HTML template with route information
- Add timeSince template function for human-readable durations
- Update templates.go to include new templates
- Server-side rendered pages as requested (no client-side API calls)
