[IMP] website_sale_aplicoop: automate non-weekly group order cycles

One-time, biweekly and monthly group orders now follow the same cron
confirmation flow as weekly ones (confirm sale orders + batch pickings
when the cycle cutoff passes):

- Biweekly/monthly keep the cutoff_day/pickup_day weekday scheme on a
  recurrence grid anchored at start_date (creation date as fallback):
  cutoffs advance +14 days / +1 month snapped to cutoff_day, with
  catch-up after cron downtime. Previously they behaved as weekly.
- One-time orders (specials/promotions) are driven by end_date
  (cutoff_date = end_date); once passed, the cron confirms, batches
  and closes the group order.
- end_date keeps its "empty = permanent" meaning for recurring orders.
- Website draft-cart lookup window is now period-aware instead of
  assuming a 6-day weekly cycle.
- New cron tests for once/biweekly/monthly cycles; i18n es/eu updated.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

website_sale_aplicoop/controllers/website_sale_validators.py

@@ -65,27 +65,39 @@ def _get_salesperson_for_order(self, partner):
 def _find_recent_draft_order(self, partner_id, group_order, request_obj=None):
     """Return the active-cycle draft sale.order for the partner, or empty.
 
-    The active ordering period ends at group_order.cutoff_date and begins
-    6 days earlier (weekly cycle). Drafts created outside this window belong
-    to a previous cycle and must not be reused — otherwise stale carts come
-    back when the user re-enters the order page.
+    The active ordering period ends at group_order.cutoff_date and its length
+    depends on the order period: 7 days (weekly), 14 days (biweekly), one
+    month (monthly). One-time orders have a single cycle starting at
+    start_date (or unbounded when start_date is empty). Drafts created
+    outside this window belong to a previous cycle and must not be reused —
+    otherwise stale carts come back when the user re-enters the order page.
     """
     req = request_obj or request
     from datetime import timedelta
 
+    from dateutil.relativedelta import relativedelta
+
     if not group_order or not group_order.cutoff_date:
         return req.env["sale.order"]
 
-    period_start = group_order.cutoff_date - timedelta(days=6)
     period_end = group_order.cutoff_date
+    if group_order.period == "weekly":
+        period_start = period_end - timedelta(days=6)
+    elif group_order.period == "biweekly":
+        period_start = period_end - timedelta(days=13)
+    elif group_order.period == "monthly":
+        period_start = period_end - relativedelta(months=1) + timedelta(days=1)
+    else:  # once: single cycle, bounded by start_date when set
+        period_start = group_order.start_date
 
     domain = [
         ("partner_id", "=", partner_id),
         ("group_order_id", "=", group_order.id),
         ("state", "=", "draft"),
-        ("create_date", ">=", f"{period_start} 00:00:00"),
         ("create_date", "<=", f"{period_end} 23:59:59"),
     ]
+    if period_start:
+        domain.append(("create_date", ">=", f"{period_start} 00:00:00"))
 
     return (
         req.env["sale.order"].sudo().search(domain, order="create_date desc", limit=1)