- Extend GET /api/v1/supplements with multi-value filters: category, brand, form,
ingredient (composition search), country, price_range, min_rating
- Add sort parameter (name, rating, price, created_at, relevance) with direction (asc/desc)
- Add GET /api/v1/supplements/filters returning available filter values with counts
- Add GET /api/v1/ingredients/{name}/supplements for ingredient-based lookup
- Implement JPA Specifications for dynamic query composition
- Add SpringDoc OpenAPI annotations for all new parameters and endpoints
- Add unit tests: 36 tests, 0 failures
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