[ADD] estate{_account}: added estate{_account} moduels - MOALN

[Mohamed-Khaled308]

Added new Modules: estate{_account}

1. Estate Module:

• Lets you list and sell estate properties.
• Add property details like type, size, rooms, garage, and price.
• Receive offers — the property status updates automatically.
• Review offers (sorted from highest to lowest) and accept or reject them.
• View properties in List, Kanban, or Form views.
• By default, shows only properties with New or Offer Received status.
• Once a property is Sold, Cancelled, or Offer Accepted, the offers list becomes read-only.

2. Estate Account Module

• It is built on both estate and account modules.
• When a property is sold, it automatically creates an invoice in the accounting app.