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/.github/workflows/pr-labeler.yml

@@ -0,0 +1,15 @@
+name: labeler
+
+on:
+  pull_request:
+    types: [opened]
+
+jobs:
+  labeler:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: TimonVS/pr-labeler-action@v3.1.0
+        with:
+          configuration-path: .github/pr-labeler.yml
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}