chore: add AI code review workflow

Author: github-actions[bot]

.github/workflows/ai-code-review.yml

@@ -0,0 +1,24 @@
+name: AI Code Review
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  review:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+      issues: write
+
+    steps:
+      - name: Run AI Code Review
+        uses: Daltonganger/AI-Code-Review@v1.4.3
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          AI_PROVIDER: 'codex'
+          CODEX_API_KEY: ${{ secrets.CODEX_API_KEY }}
+          CODEX_API_MODEL: 'gpt-5.4'
+          CODEX_API_BASE_URL: 'https://codex.2631.eu/v1'
+          REVIEW_LANGUAGE: 'en'