Phase 1 MVP: synchronous OCR + regex header extraction

Implements the foundation of the OCR Sprint service:
- FastAPI app with /api/v1/health and /api/v1/documents (sync upload)
- Pydantic v2 schemas for documents, extraction result, personnel
- Pipeline: PDF/image ingest (PyMuPDF), preprocessing (resize, deskew,
  denoise, optional adaptive threshold), PaddleOCR wrapper, regex-based
  header extraction (nomor sprint, tanggal, satuan, perihal, dasar),
  signatory NRP, master-pangkat validation, confidence scoring + routing.
- Tests: 61 unit tests covering regex rules, validators, preprocess,
  ingest, confidence, and API contract (PaddleOCR mocked).
- Tooling: pyproject (setuptools), ruff, mypy strict, pytest, pre-commit,
  Dockerfile, docker-compose, Makefile.
- Docs: README + docs/architecture.md (full hybrid stack rationale and
  6-phase roadmap).

Co-authored-by: adrian kuman firmansah <adriancuman@gmail.com>

.gitignore

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+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+dist/
+*.egg-info/
+*.egg
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+.coverage
+.coverage.*
+htmlcov/
+coverage.xml
+.tox/
+.nox/
+
+# Virtual environments
+.venv/
+venv/
+env/
+ENV/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+.DS_Store
+
+# Environment / secrets
+.env
+.env.*
+!.env.example
+
+# Local data & artifacts
+samples/*.pdf
+samples/*.PDF
+samples/*.jpg
+samples/*.JPG
+samples/*.jpeg
+samples/*.png
+samples/*.PNG
+samples/*.tif
+samples/*.tiff
+!samples/README.md
+data/local/
+storage/
+*.db
+*.sqlite
+*.sqlite3
+
+# OCR / model caches
+.paddleocr/
+~/.paddleocr/
+models/downloaded/
+
+# Logs
+logs/
+*.log
+
+# Docker
+.docker/
+
+# Misc
+*.bak
+*.tmp