fix: commite UserRepository.java et corrige out/ dans .gitignore

out/ sans / initial ignorait application/port/out/, qui est un répertoire
valide de la Clean Architecture.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/main/java/com/olhar/olharapi/application/port/out/UserRepository.java

@@ -0,0 +1,13 @@
+package com.olhar.olharapi.application.port.out;
+
+import com.olhar.olharapi.domain.model.User;
+
+import java.util.Optional;
+import java.util.UUID;
+
+public interface UserRepository {
+    User save(User user);
+    Optional<User> findByEmail(String email);
+    Optional<User> findById(UUID id);
+    boolean existsByEmail(String email);
+}