refactor: structure of an hexagonal architecture

Created a kernel crate to store models and future action implementations.
Will be useful to create admin cli.

tests/hurl_integration/scenario_1/init_db.sh

@@ -0,0 +1,9 @@
+password_hash="$(echo -n "root" | argon2 salt_06cGGWYDJCZ -e)"
+echo $password_hash
+SQL=$(cat <<EOF
+    INSERT INTO users
+        (id, handle, email, roles, status, password_hash, created_at)
+        VALUES
+        ('$(uuid)', 'root', 'root@example.org', '[]', 'Active', '$password_hash', '2024-11-30T00:00:00Z');
+EOF)
+echo $SQL | sqlite3 $DB_PATH