M1: Grundgerüst, Datenmodell und Admin

Django-5.2-Projekt mit uv, django-environ und Docker-Compose-Setup
(web + Postgres, WeasyPrint-Systembibliotheken im Image). Vollständiges
Datenmodell (Firma, Therapeut, Auftraggeber, Teilnehmer, Leistungsart,
Leistung, InvoiceLog, InvoiceCounter) mit Admin, Login-Flow und
Platzhalter-Dashboard. Fortschritt in FORTSCHRITT.md.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016yy3uodsai6Ytt3GJ7tBdz

manage.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python
+"""Django's command-line utility for administrative tasks."""
+
+import os
+import sys
+
+
+def main():
+    """Run administrative tasks."""
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings")
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == "__main__":
+    main()