Adds GET /api/conversations/search?q=<query> endpoint that searches
message content across all authenticated user's conversations using
PostgreSQL ILIKE. Supports limit/offset pagination (default limit=20)
and returns results sorted by recency with conversation context.
Co-Authored-By: Claude Sonnet 4.6 <[email protected]>
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GET /api/conversations/search?q=query with ILIKE, user-scoped, pagination. SearchMessagesDto with validation.