feat: initial nutri-api — Spring Boot REST API for supplement catalog

- Supplement and Ingredient entities with UUID primary keys
- CRUD REST API with pagination, filtering, and full-text search
- Liquibase migrations with PostgreSQL tsvector full-text index
- SpringDoc OpenAPI documentation
- RFC 7807 Problem Details error handling
- Unit tests for service, mapper, and controller layers (23 tests)
- Dockerfile (multi-stage) and docker-compose.yaml for local dev
- Application profiles: default, dev, prod

.gitignore

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+target/
+*.class
+*.jar
+*.war
+*.iml
+.idea/
+.vscode/
+*.log
+.env
+.DS_Store