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/tests/utils/test_utils.nim

@@ -0,0 +1,16 @@
+discard """
+  cmd: "nim c -d:reset $file"
+"""
+# nim c -r tests/utils/test_utils.nim
+
+
+import std/unittest
+import ../../src/allographer/utils/snake_to_camel
+
+
+suite("test utils"):
+  test("snakeToCamel"):
+    check snakeToCamel("test") == "Test"
+    check snakeToCamel("test_case") == "TestCase"
+    check snakeToCamel("test_case_abc") == "TestCaseAbc"
+    check snakeToCamel("test_case_1") == "TestCase1"