[LFXV2-887] Add V1 meeting RSVP enricher for indexing RSVP data

[andrest50]

Ticket

LFXV2-887

Summary

• Implement V1MeetingRSVPEnricher to handle V1 meeting RSVP messages
• Use meeting_id for meeting-level access control permissions
• Set access relation to "auditor" for read-only RSVP access
• Set history relation to "writer" for modification tracking
• Extract email field as sort name and alias for searchability

Changes

• Created v1_meeting_rsvp_enricher.go with custom access control logic
• Added ObjectTypeV1MeetingRSVP constant to messaging constants
• Registered new enricher in IndexerService

🤖 Generated with Claude Code

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch andrest50/v1-meeting-rsvp

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