[FIX] website_sale_aplicoop: Critical date calculation fixes (v18.0.1.3.1)

- Fixed _compute_cutoff_date logic: Changed days_ahead <= 0 to days_ahead < 0 to allow cutoff_date same day as today
- Enabled store=True for delivery_date field to persist calculated values and enable database filtering
- Added constraint _check_cutoff_before_pickup to validate pickup_day >= cutoff_day in weekly orders
- Added @api.onchange methods for immediate UI feedback when changing cutoff_day or pickup_day
- Created daily cron job _cron_update_dates to automatically recalculate dates for active orders
- Added 'Calculated Dates' section in form view showing readonly cutoff_date, pickup_date, delivery_date
- Added 6 regression tests with @tagged('post_install', 'date_calculations')
- Updated documentation with comprehensive changelog

This is a more robust fix than v18.0.1.2.0, addressing edge cases in date calculations.

website_sale_aplicoop/__manifest__.py

@@ -3,7 +3,7 @@
 
 {  # noqa: B018
     "name": "Website Sale - Aplicoop",
-    "version": "18.0.1.1.1",
+    "version": "18.0.1.3.1",
     "category": "Website/Sale",
     "summary": "Modern replacement of legacy Aplicoop - Collaborative consumption group orders",
     "author": "Odoo Community Association (OCA), Criptomart",
@@ -24,6 +24,8 @@
         "data/groups.xml",
         # Datos: Menús del website
         "data/website_menus.xml",
+        # Datos: Cron jobs
+        "data/cron.xml",
         # Vistas de seguridad
         "security/ir.model.access.csv",
         "security/record_rules.xml",