feat: audit vocabulary/term/authority creation, attributing the acting user (#21)

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

crates/db/tests/authority.rs

@@ -1,5 +1,5 @@
 use db::{Db, authority};
-use domain::{AuthorityKind, LocalizedLabel, NewAuthority};
+use domain::{AuditActor, AuthorityKind, LocalizedLabel, NewAuthority};
 use sqlx::PgPool;
 
 fn new_person(name_sv: &str, name_en: &str) -> NewAuthority {
@@ -24,9 +24,13 @@ async fn authority_round_trips_with_labels(pool: PgPool) {
     let db = Db::from_pool(pool);
 
     let mut tx = db.pool().begin().await.unwrap();
-    let id = authority::create_authority(&mut tx, &new_person("Carl Larsson", "Carl Larsson"))
-        .await
-        .unwrap();
+    let id = authority::create_authority(
+        &mut tx,
+        AuditActor::System,
+        &new_person("Carl Larsson", "Carl Larsson"),
+    )
+    .await
+    .unwrap();
     tx.commit().await.unwrap();
 
     let got = authority::authority_by_id(db.pool(), id)
@@ -47,11 +51,12 @@ async fn list_by_kind_filters(pool: PgPool) {
     let db = Db::from_pool(pool);
 
     let mut tx = db.pool().begin().await.unwrap();
-    authority::create_authority(&mut tx, &new_person("A", "A"))
+    authority::create_authority(&mut tx, AuditActor::System, &new_person("A", "A"))
         .await
         .unwrap();
     authority::create_authority(
         &mut tx,
+        AuditActor::System,
         &NewAuthority {
             kind: AuthorityKind::Place,
             external_uri: None,
@@ -83,7 +88,7 @@ async fn resolve_authority_returns_kind(pool: PgPool) {
     let db = Db::from_pool(pool);
 
     let mut tx = db.pool().begin().await.unwrap();
-    let id = authority::create_authority(&mut tx, &new_person("X", "X"))
+    let id = authority::create_authority(&mut tx, AuditActor::System, &new_person("X", "X"))
         .await
         .unwrap();
     tx.commit().await.unwrap();
@@ -108,6 +113,7 @@ async fn authority_with_no_labels_round_trips_empty(pool: PgPool) {
     let mut tx = db.pool().begin().await.unwrap();
     let id = authority::create_authority(
         &mut tx,
+        AuditActor::System,
         &NewAuthority {
             kind: AuthorityKind::Organisation,
             external_uri: None,