Initial commit: breakpilot-lehrer - Lehrer KI Platform

Services: Admin-Lehrer, Backend-Lehrer, Studio v2, Website,
Klausur-Service, School-Service, Voice-Service, Geo-Service,
BreakPilot Drive, Agent-Core

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

backend-lehrer/middleware/__init__.py

@@ -0,0 +1,26 @@
+"""
+BreakPilot Middleware Stack
+
+This module provides middleware components for the FastAPI backend:
+- Request-ID: Adds unique request identifiers for tracing
+- Security Headers: Adds security headers to all responses
+- Rate Limiter: Protects against abuse (Valkey-based)
+- PII Redactor: Redacts sensitive data from logs
+- Input Gate: Validates request body size and content types
+"""
+
+from .request_id import RequestIDMiddleware, get_request_id
+from .security_headers import SecurityHeadersMiddleware
+from .rate_limiter import RateLimiterMiddleware
+from .pii_redactor import PIIRedactor, redact_pii
+from .input_gate import InputGateMiddleware
+
+__all__ = [
+    "RequestIDMiddleware",
+    "get_request_id",
+    "SecurityHeadersMiddleware",
+    "RateLimiterMiddleware",
+    "PIIRedactor",
+    "redact_pii",
+    "InputGateMiddleware",
+]