Update Feasycom product links in ibeacon markdown

[sevorl]

Updated broken links to Feasycom beacons

Proposed change

Type of change

• Spelling, grammar or other readability improvements (current branch).
• Adjusted missing or incorrect information in the current documentation (current branch).
• Added documentation for a new integration I'm adding to Home Assistant (next branch).
  • I've opened up a PR to add logos and icons in Brands repository.
• Added documentation for a new feature I'm adding to Home Assistant (next branch).
• Removed stale or deprecated documentation.

Additional information

• Link to parent pull request in the codebase:
• Link to parent pull request in the Brands repository:
• This PR fixes or closes issue: fixes #

Checklist

• This PR uses the correct branch, based on one of the following:
  • I made a change to the existing documentation and used the current branch.
  • I made a change that is related to an upcoming version of Home Assistant and used the next branch.
• The documentation follows the Home Assistant documentation standards.

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[Copilot]

Pull request overview

This PR updates broken product links for four Feasycom iBeacon models in the iBeacon integration documentation. The links are being updated to point to the current product pages on the Feasycom website, which follow a consistent /product/{model}/ URL structure.

Key Changes

• Updated URLs for three Feasycom beacon models (FSC-BP103B, FSC-BP104D, FSC-BP108) to use the new product page structure
• Links now follow a consistent pattern across all Feasycom products