feat(project): initialize ZUGFeRD service with pyproject.toml and directory structure

src/__init__.py

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+"""ZUGFeRD Service Package."""
+
+__version__ = "1.0.0"

src/extractor.py

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+"""ZUGFeRD extraction module."""
+
+pass

src/main.py

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+"""FastAPI application for ZUGFeRD invoice processing."""
+
+import uvicorn
+from fastapi import FastAPI
+
+app = FastAPI(
+    title="ZUGFeRD Service",
+    version="1.0.0",
+    description="REST API for ZUGFeRD invoice extraction and validation",
+)
+
+
+def run(host: str = "0.0.0.0", port: int = 5000) -> None:
+    """Run the FastAPI application.
+
+    Args:
+        host: Host to bind to.
+        port: Port to listen on.
+    """
+    uvicorn.run(app, host=host, port=port)

src/models.py

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+"""Pydantic models for ZUGFeRD service."""
+
+pass

src/pdf_parser.py

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+"""PDF text parsing module."""
+
+pass

src/utils.py

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+"""Utility functions for ZUGFeRD service."""
+
+pass

src/validator.py

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+"""Validation module for ZUGFeRD invoices."""
+
+pass