Feat/full text search

[mijinummi]

Pull Request: Implement Full-Text Search

Overview

This PR implements issue #380 Implement Full-Text Search.
It adds PostgreSQL full-text search with relevance ranking, suggestions, and filters.

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Changes Introduced

• Added full-text indexes to Prisma schema.
• Implemented SearchService with relevance-ranked queries.
• Added /search/projects endpoint for text search.
• Added /search/suggest endpoint for search suggestions.
• Supported filters for category, date, and user.

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Acceptance Criteria ✅

• Text search implemented
• Relevance ranking applied
• Suggestions available
• Filters supported
• Tests added

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How to Test

1. Call /search/projects?q=insurance → ranked results.
2. Call /search/suggest?q=ins → suggestions returned.
3. Apply filters (e.g., category=finance) → filtered results.
4. Verify ranking order matches relevance.

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Contribution Notes

• Close Implement Full-Text Search #380

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