fix(ci/cd): remove hardcoded absolute path in GitHub Actions workflow

Fixes the error: "cd: /home/user/IntelliDocs-ngx: No such file or directory"

Changes:
- Removed hardcoded absolute path `/home/user/IntelliDocs-ngx` from line 48
- After `actions/checkout@v4`, the runner is already in the project directory
- Using the implicit `${{ github.workspace }}` is the standard practice

This fixes the workflow failure in the "Install Python dependencies" step
of the "test-ml-dependencies" job.

Issue: GitHub Actions runners don't have this local development path
Solution: Rely on the default working directory set by actions/checkout

.github/workflows/docker-intellidocs.yml

@@ -45,7 +45,6 @@ jobs:
 
       - name: Install Python dependencies
         run: |
-          cd /home/user/IntelliDocs-ngx
           uv sync --all-extras
 
       - name: Test ML/OCR imports