Upgrade from pre-defined stations to dynamic admin-configurable stations

[Copilot]

Replaces hardcoded "kitchen", "bar", "gng" stations with a dynamic Station model that can be created/managed via admin interface. Maintains full backward compatibility with existing data.

Model Changes

• Station: Added unique code constraint, get_or_create_default_stations() helper
• Dish: Added station_code property falling back to legacy field, effective_station property
• Order: Added dynamic station status methods:
  • get_station_status(), set_station_status() for per-station control
  • all_stations_complete(), all_stations_approved_or_complete() for aggregate checks
  • Uses M2M fields status_0_stations through status_4_stations for dynamic tracking

Usage

# Creating a new station
Station.objects.create(friendly_name="Pastry", code="pastry", icon="cake")

# Assigning to dish
dish.new_station = Station.objects.get(code="pastry")

# Order status management
order.set_station_status("pastry", 1)  # Approved
order.all_stations_complete()  # True when all done

Other Updates

• Views: POS, online store, deliveries updated to use dynamic stations
• Templates: Station names rendered dynamically with fallback to legacy labels
• Admin: Enhanced DishAdmin with station filtering, StationAdmin with list display
• Migration: Creates default stations (Kitchen, Bar, Grab & Go) and migrates existing dishes

Screenshot

Original prompt

Can you upgrade the system from pre-defined stations like "kitchen", "bar", "gng" to have dynamic stations that can be created in the admin interface and be asigned to each dish.

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