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/pr-labeler.yml

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+feature: feature*
+bug: hotfix*
+chore: chore*

clients/nim-allographer/.github/release-drafter.yml

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+name-template: 'v$NEXT_PATCH_VERSION'
+tag-template: 'v$NEXT_PATCH_VERSION'
+categories:
+  - title: '🚀 Features'
+    labels:
+      - 'feature'
+      - 'enhancement'
+  - title: '🐛 Bug Fixes'
+    labels:
+      - 'fix'
+      - 'bugfix'
+      - 'bug'
+  - title: '🧰 Maintenance'
+    label: 'chore'
+change-template: '- $TITLE @$AUTHOR (#$NUMBER)'
+template: |
+  ## Changes
+
+  $CHANGES

clients/nim-allographer/.github/workflows/docs.yml.bk

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+name: Deploy API documents
+
+on:
+  push:
+    branches:
+    - main
+
+jobs:
+  build-docs-deploy:
+    env:
+      NIM_VERSION: 1.4.4
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Cache choosenim
+      id: cache-choosenim
+      uses: actions/cache@v1
+      with:
+        path: ~/.choosenim
+        key: ${{ runner.os }}-choosenim-${{ env.NIM_VERSION }}
+    - uses: jiro4989/setup-nim-action@v1
+      with:
+        nim-version: ${{ env.NIM_VERSION }}
+    - name: Build
+      run: nimble install -Y
+    - name: Generate documents
+      run: nimble docs
+    - name: Deploy
+      uses: peaceiris/actions-gh-pages@v2.4.0
+      env:
+        ACTIONS_DEPLOY_KEY: ${{ secrets.ACTIONS_DEPLOY_KEY }}
+        PUBLISH_BRANCH: gh-pages
+        PUBLISH_DIR: ./docs

clients/nim-allographer/.github/workflows/nim.yml

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+name: Build and test Nim
+
+# テストはPRだけ
+on:
+  pull_request:
+    paths-ignore:
+      - '*.md'
+      - 'documents/*'
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "test"
+  cancel-in-progress: false
+
+jobs:
+  # WIP でジョブがスキップされてもCIが失敗した扱いにならないようにするため
+  skip:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "Skip job"
+
+  # WIP がコミットメッセージに含まれているとジョブを起動しない
+  before:
+    runs-on: ubuntu-latest
+    if: "! contains(github.event.head_commit.message, 'WIP')"
+    steps:
+      - run: echo "no WIP"
+
+  test-on-docker-nim:
+    runs-on: ubuntu-latest
+    needs: before
+    strategy:
+      fail-fast: false
+      matrix:
+        nim-version:
+          - 2.0.16
+          - 2.2.8
+    env:
+      NIM_VERSION: ${{ matrix.nim-version }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build docker image
+        run: docker compose -f compose.test.yaml build app
+      - name: Start dependencies
+        run: docker compose -f compose.test.yaml up -d postgres mysql mariadb surreal
+      - name: Test
+        run: docker compose -f compose.test.yaml run --rm --no-deps app nimble test
+
+
+  # アプリケーションの方を使うことにした
+  # https://github.com/marketplace/actions/release-drafter
+  # create-tag-draft:
+  #   runs-on: ubuntu-latest
+  #   if: github.ref == 'refs/heads/master'
+  #   needs:
+  #     - test-on-docker
+  #   steps:
+  #     - uses: release-drafter/release-drafter@v5.3.1
+  #       env:
+  #         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

clients/nim-allographer/.github/workflows/pr-labeler.yml

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+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 }}