fix: handle multi-value custom fields in AI context builder

[ManukMinasyan]

Summary

• Prevent "Array to string conversion" when RecordContextBuilder returns array values for multi-value fields like domains
• Add implode() handling in both RecordContextBuilder::getCompanyBasicInfo() and RecordSummaryService::addBasicInfo()
• Add regression test covering multi-value custom fields in context builder output

Test plan

• php artisan test --compact tests/Feature/AI/RecordSummaryServiceTest.php — 17 passed

[Copilot]

Pull request overview

Fixes AI context/prompt building when custom fields return multi-value arrays (e.g., company domains), preventing “Array to string conversion” errors and ensuring consistent string output for basic info.

Changes:

• Convert multi-value domains custom field values into a comma-separated string in RecordContextBuilder::getCompanyBasicInfo().
• Add defensive array-to-string conversion in RecordSummaryService::addBasicInfo() when formatting the prompt.
• Add a regression test asserting multi-value company domains are emitted as a string in basic_info.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/Feature/AI/RecordSummaryServiceTest.php	Adds regression coverage for multi-value custom field output in the context builder.
app/Services/AI/RecordSummaryService.php	Prevents array-to-string conversion errors when basic info values are arrays during prompt formatting.
app/Services/AI/RecordContextBuilder.php	Ensures company domains are rendered as a comma-separated string in basic_info.