Enhance AbstractNumberGenerator docblock with implementation requirements

[Copilot]

Improved documentation for AbstractNumberGenerator to clarify its role as the base class for all number generators and document required child class properties.

Changes

• Foundation context: Added explanation that this is the base for all number generators (invoices, quotes, expenses, projects, tasks, payments, customers)
• Implementation requirements: Documented that child classes must define:
  • $type (required): Entity type identifier (e.g., 'Invoice', 'Quote', 'Project')
  • $groupName (optional): Default numbering scheme name (e.g., 'Default Invoice Numbering')

Example child class:

class InvoiceNumberGenerator extends AbstractNumberGenerator
{
    protected string $type = 'Invoice';
    protected ?string $groupName = 'Default Invoice Numbering';
}

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