Fix CI test job dependency install and align package modules with current test imports

[Copilot]

The test GitHub Actions job failed because CI attempted to install requirements.txt, which no longer exists in this repo. This PR switches CI to install from pyproject.toml and restores the package modules currently referenced by the test suite.

• CI dependency installation

  • Updated .github/workflows/ci.yml to install project + dev dependencies from pyproject.toml:

  - name: Install dependencies
    run: |
      python -m pip install --upgrade pip
      pip install ".[dev]"

• Package module completeness for test collection

  • Added missing modules imported by existing tests:
    • docling_pk/preprocessor.py
    • docling_pk/ocr.py
    • docling_pk/parsers/__init__.py
    • docling_pk/parsers/cnic.py
    • docling_pk/parsers/matric.py
    • docling_pk/parsers/intermediate.py
    • docling_pk/parsers/_federal_board.py
  • Included minimal parser/preprocessing/OCR implementations so imports and expected code paths resolve under the current repository layout.