feat: complete person identity matching system with fuzzy detection, revert, and manual link

Implements the full identity matching engine: email matching (HIGH confidence),
fuzzy name matching with Levenshtein distance (MEDIUM confidence, upgradable to
HIGH with DOB tiebreaker), manual link/unlink, revert confirmed matches, and
automatic detection via PersonObserver. Includes 33 comprehensive tests, frontend
integration with confirm/dismiss/unlink UI, and match indicators in the persons list.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/app/src/pages/events/[id]/persons/index.vue

@@ -294,6 +294,29 @@ const crowdTypeOptions = computed(() => [
               <span class="text-caption">{{ getInitials(item.full_name) }}</span>
             </VAvatar>
             <span>{{ item.full_name }}</span>
+            <VTooltip
+              v-if="item.pending_identity_match"
+              location="top"
+            >
+              <template #activator="{ props: tooltipProps }">
+                <VIcon
+                  v-bind="tooltipProps"
+                  size="16"
+                  color="warning"
+                >
+                  tabler-link
+                </VIcon>
+              </template>
+              Mogelijke match: {{ item.pending_identity_match.matched_user.full_name }}
+              ({{ item.pending_identity_match.confidence_label }})
+            </VTooltip>
+            <VIcon
+              v-else-if="item.has_user_account"
+              size="16"
+              color="success"
+            >
+              tabler-user-check
+            </VIcon>
           </div>
         </template>