Initial commit: breakpilot-core - Shared Infrastructure

Docker Compose with 24+ services:
- PostgreSQL (PostGIS), Valkey, MinIO, Qdrant
- Vault (PKI/TLS), Nginx (Reverse Proxy)
- Backend Core API, Consent Service, Billing Service
- RAG Service, Embedding Service
- Gitea, Woodpecker CI/CD
- Night Scheduler, Health Aggregator
- Jitsi (Web/XMPP/JVB/Jicofo), Mailpit

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend-core/config.py

@@ -0,0 +1,18 @@
+from pathlib import Path
+
+BASE_DIR = Path.home() / "Arbeitsblaetter"
+EINGANG_DIR = BASE_DIR / "Eingang"
+BEREINIGT_DIR = BASE_DIR / "Bereinigt"
+EDITIERBAR_DIR = BASE_DIR / "Editierbar"
+NEU_GENERIERT_DIR = BASE_DIR / "Neu_generiert"
+
+VALID_SUFFIXES = {".jpg", ".jpeg", ".png", ".pdf", ".JPG", ".JPEG", ".PNG", ".PDF"}
+
+# Ordner sicherstellen
+for d in [EINGANG_DIR, BEREINIGT_DIR, EDITIERBAR_DIR, NEU_GENERIERT_DIR]:
+    d.mkdir(parents=True, exist_ok=True)
+
+
+def is_valid_input_file(path: Path) -> bool:
+    """Gemeinsame Filterlogik für Eingangsdateien."""
+    return path.is_file() and not path.name.startswith(".") and path.suffix in VALID_SUFFIXES