feat: approve priced carts at checkout so customers can pay at once

Every quote waited for an operator before it could be paid, so an order
placed at night waited for the morning. A cart the Site priced is now
approved when the quote is created, through the same server pricing the
operator's approval uses (app/quote_review.py). Orders above
QUOTE_AUTO_MAX_METRES (50 m) and items claiming a discount on art the Site
could not analyse still wait for review; the Kanban shows which quotes were
approved automatically and why the others wait.

The grade is still computed in the browser (roadmap 3.2, 3.9), so the
discount remains a customer-supplied value until the server computes it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/api/quotes.py

@@ -1,4 +1,4 @@
-"""Quotes: the customer's cart, and the operator-reviewed version of it."""
+"""Quotes: the customer's cart, approved at once when it can be (app/quote_review.py)."""
 import hashlib
 import json
 from decimal import Decimal
@@ -10,6 +10,7 @@ from psycopg.types.json import Jsonb
 from ..core import db
 from ..core.auth import owner
 from ..core.models import QuoteRequest
+from .. import quote_review
 from ..runtime import freight, quote_view, require_delivery_available, upload_row
 from ..scanning import require_clean
 
@@ -37,10 +38,14 @@ def create_quote(body: QuoteRequest, session_id=Depends(owner)):
         uid = uuid4()
         c.execute('INSERT INTO dtf_local.quotes(id,owner,request_key,request_hash,draft) VALUES(%s,%s,%s,%s,%s) ON CONFLICT(owner,request_key) DO NOTHING',
                   (uid, session_id, body.request_key, digest, Jsonb(draft)))
-        row = c.execute('SELECT * FROM dtf_local.quotes WHERE owner=%s AND request_key=%s', (session_id, body.request_key)).fetchone()
+        row = c.execute('SELECT * FROM dtf_local.quotes WHERE owner=%s AND request_key=%s FOR UPDATE', (session_id, body.request_key)).fetchone()
         if row['request_hash'] != digest:
             raise HTTPException(409, 'Request key already used for a different cart')
-    return {'id': row['id'], 'status': 'pending_review'}
+        reason = quote_review.review_reason(draft)
+        if row['id'] == uid and reason is None:
+            quote_review.approve(c, row, body.items, quote_review.AUTO)
+            return {'id': row['id'], 'status': 'approved'}
+    return {'id': row['id'], 'status': 'approved' if row['approved'] else 'pending_review'}
 
 @router.get('/api/quotes/{uid}')
 def get_quote(uid: UUID, session_id=Depends(owner)):