Phase 2: Fix high-priority security and stability issues (H1-H7)

H1: Sanitize error endpoint context (strip tokens/passwords, limit depth/size)
H2: Rate limiter IP spoofing fix (trusted proxy CIDR check for X-Forwarded-For)
H3: CSRF middleware uses Redis singleton instead of per-request connection
H4: WebSocket origin verification added to both kommunikation and ai_ui_control
H5: Storage path traversal protection, get_url() returns relative URL not filesystem path
H6: Security headers middleware (HSTS, X-Content-Type-Options, X-Frame-Options, CSP, Referrer-Policy)
H7: Forward-repair migration 0045 for databases that ran original 0021/0027

Also: add trusted_proxy_cidrs to config, add verify_ws_origin to auth

app/core/auth.py

@@ -91,6 +91,23 @@ def hash_token(token: str) -> str:
     return hashlib.sha256(token.encode()).hexdigest()
 
 
+def verify_ws_origin(websocket) -> bool:
+    """Verify that the WebSocket upgrade request comes from an allowed origin.
+
+    Checks the Origin header against the configured CORS origins.
+    Returns True if the origin is allowed or if no CORS restriction is configured.
+    """
+    from app.config import get_settings
+    settings = get_settings()
+    allowed_origins = settings.cors_origin_list
+    if not allowed_origins:
+        return True
+    origin = websocket.headers.get("origin", "")
+    if not origin:
+        return True  # Non-browser clients don't send Origin
+    return origin in allowed_origins
+
+
 async def create_session(
     db: AsyncSession,
     redis: aioredis.Redis,