feat: add Date factory support for model date handling

[binaryfire]

Summary

This PR adds support for the Date::use() configuration in Eloquent models, allowing applications to use CarbonImmutable (or other custom date classes) throughout the framework. This matches Laravel's functionality.

Hyperf's model date handling hardcodes Carbon:: directly, which means that even if you configure Date::use(CarbonImmutable::class) in a service provider, model date operations still return mutable Carbon instances. This PR fixes that by overriding the relevant methods to use the Date facade instead.

Problem

In Laravel, you can do this in a service provider:

use Carbon\CarbonImmutable;
use Illuminate\Support\Facades\Date;

public function boot()
{
    Date::use(CarbonImmutable::class);
}

And then the framework returns CarbonImmutable from:

• Date casts ('date', 'datetime', 'timestamp')
• Model timestamps (created_at, updated_at)
• $model->freshTimestamp()

Hypervel didn't support this because Hyperf hardcodes Carbon:: in HasAttributes::asDateTime() and HasTimestamps::freshTimestamp().

Solution

Override the relevant methods in Hypervel to use the Date facade:

• HasAttributes - Add asDate() and asDateTime() methods that use Date::instance(), Date::parse(), Date::createFromTimestamp(), etc.
• HasTimestamps - New trait with freshTimestamp() using Date::now()
• Model, Pivot, MorphPivot - Use the new HasTimestamps trait

Changes

File	Change
HasAttributes.php	Added asDate() and asDateTime() methods
HasTimestamps.php	New trait with freshTimestamp()
Model.php	Added use HasTimestamps
Pivot.php	Added use HasTimestamps
MorphPivot.php	Added use HasTimestamps
DateFactoryTest.php	22 tests covering all scenarios

Test Coverage

The test suite covers:

• Date facade returns configured class (Date::now(), Date::parse(), etc.)
• Model::freshTimestamp() respects Date factory
• asDateTime() handles all input types (Carbon, DateTime, timestamps, strings)
• Date and datetime casts return configured class
• Pivot and MorphPivot models respect Date factory
• Reset to default with DateFactory::useDefault()

Usage

// In a service provider
use Carbon\CarbonImmutable;
use Hypervel\Support\Facades\Date;

public function boot()
{
    Date::use(CarbonImmutable::class);
}

// Now all model dates are immutable
$user = User::find(1);
$user->created_at; // CarbonImmutable instance
$user->freshTimestamp(); // CarbonImmutable instance