feat(person): add name-match tokenizer for direct matching (#763)

Lowercase, split on whitespace/hyphen/apostrophe, drop empties. Applied
symmetrically to query and candidate name components so "Anna-Maria" and
"Anna Maria" tokenize alike. Foundation for resolveByName direct matching.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/src/main/java/org/raddatz/familienarchiv/person/PersonService.java

@@ -1,8 +1,12 @@
 package org.raddatz.familienarchiv.person;
 
+import java.util.ArrayList;
 import java.util.Comparator;
+import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Locale;
 import java.util.Optional;
+import java.util.Set;
 import java.util.UUID;
 
 import org.springframework.lang.Nullable;
@@ -24,9 +28,11 @@ import org.springframework.transaction.annotation.Transactional;
 import org.springframework.web.server.ResponseStatusException;
 
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 
 @Service
 @RequiredArgsConstructor
+@Slf4j
 public class PersonService {
 
     private final PersonRepository personRepository;
@@ -103,6 +109,22 @@ public class PersonService {
         return personRepository.searchByName(fragment);
     }
 
+    // Name-match tokenizer (issue #763): lowercase, split on whitespace/hyphen/apostrophe,
+    // drop empties. Applied symmetrically to the query and to every candidate name component so
+    // that "Anna-Maria" and "Anna Maria" tokenize alike. Order-preserving for deterministic tests.
+    static Set<String> tokenize(String raw) {
+        if (raw == null || raw.isBlank()) {
+            return Set.of();
+        }
+        LinkedHashSet<String> tokens = new LinkedHashSet<>();
+        for (String part : raw.toLowerCase(Locale.ROOT).split("[\\s\\-']+")) {
+            if (!part.isEmpty()) {
+                tokens.add(part);
+            }
+        }
+        return tokens;
+    }
+
     public List<Person> findAllFamilyMembers() {
         return personRepository.findByFamilyMemberTrueOrderByLastNameAscFirstNameAsc();
     }