feat(clients): add nim-allographer client with BaraDB driver support

- Pure Nim wire protocol client (async + sync, no C FFI)
- Query Builder: fluent API, SQL generator, execution, transactions
- Schema Builder: create/alter/drop tables, column operations
- Connection pool with aging and timeout handling
- ORM integration via compile-time DB_BARADB switch
- Tests: test_open, test_query
- Documentation: README.md, PLAN_BARADB.md

clients/nim-allographer/permission.sh

@@ -0,0 +1,8 @@
+local_UID=$(id -u $USER)
+local_GID=$(id -g $USER)
+
+echo 'start'
+sudo chown ${local_UID}:${local_GID} * -R
+echo '======================'
+sudo chown ${local_UID}:${local_GID} .* -R
+echo 'end'