fix: harden week-two ordering, artwork and operations

app/api/health.py

@@ -1,10 +1,9 @@
 """Health, session bootstrap and freight quoting."""
-import os
-
 from fastapi import APIRouter, HTTPException, Request, Response
 
 from ..core import db
 from ..core.auth import client_ip, owner, new_session, rate_limit
+from ..core.limits import upload_limit_bytes
 from ..core.models import Freight
 from ..runtime import ENVIRONMENT, GUEST_SESSION_LIMIT, PART_BYTES, freight, storage
 
@@ -33,7 +32,7 @@ def session(request: Request, response: Response):
         with db.connect() as c:
             session_id = new_session(c, response)
     return {'environment': ENVIRONMENT, 'cart_scope': str(session_id), 'part_bytes': PART_BYTES,
-            'max_upload_bytes': int(os.environ.get('MAX_UPLOAD_BYTES', '5368709120'))}
+            'max_upload_bytes': upload_limit_bytes()}
 
 @router.post('/api/freight')
 def quote_freight(body: Freight):