feat(pages): optimize GitHub Pages artifact handling and improve build configuration

- Update vitest-reports artifact download paths to use .gh-pages-cache for better organization
- Fix .gitignore core dump pattern to be more general (core instead of /core)
- Update .pages structure with migrated documentation and configuration
- Refine Knip configuration to exclude .pages directory while keeping vite.config.ts
- Improve build-pages.sh script to use relative paths consistently for .pages directory

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/release-pages.yml

@@ -65,7 +65,7 @@ jobs:
         uses: actions/download-artifact@v4
         with:
           name: vitest-reports
-          path: ./.pages
+          path: ./.gh-pages-cache/vitest-reports
           run-id: ${{ github.event.workflow_run.id }}
           github-token: ${{ secrets.GITHUB_TOKEN }}
 
@@ -79,7 +79,7 @@ jobs:
           name: vitest-reports
           branch: main
           workflow_conclusion: success
-          path: ./.pages
+          path: ./.gh-pages-cache/vitest-reports
 
       - name: Build static assets (with artifact reuse)
         run: ./scripts/build-pages.sh