chore: reorganize rust crates

crates/libpk/src/db/repository/auth.rs

@@ -0,0 +1,20 @@
+pub async fn legacy_token_auth(
+    pool: &sqlx::postgres::PgPool,
+    token: &str,
+) -> anyhow::Result<Option<i32>> {
+    let mut system: Vec<LegacyTokenDbResponse> =
+        sqlx::query_as("select id from systems where token = $1")
+            .bind(token)
+            .fetch_all(pool)
+            .await?;
+    Ok(if let Some(system) = system.pop() {
+        Some(system.id)
+    } else {
+        None
+    })
+}
+
+#[derive(sqlx::FromRow)]
+struct LegacyTokenDbResponse {
+    id: i32,
+}