Improve push middleware dispatch

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️
Tests pass?	✔️

[Copilot]

Pull request overview

Refactors the push middleware execution path to avoid nested dispatching by pre-combining base dispatcher middleware with queue-specific middleware, updating integration coverage to validate the full composed pipeline order.

Changes:

• Queue now prepares a per-queue push dispatcher by combining base dispatcher middleware with queue-specific middleware.
• PushMiddlewareDispatcher adds withMiddlewaresAdded() to append middleware definitions to an existing dispatcher instance.
• Integration test updates the expected push middleware stack to cover additional appended middleware.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tests/Integration/MiddlewareTest.php	Extends the integration test to validate appended push middleware order with an extra stage.
src/Queue.php	Switches push dispatching to a prepared combined dispatcher and removes the nested dispatcher handler.
src/Middleware/Push/PushMiddlewareDispatcher.php	Adds withMiddlewaresAdded() API for appending middleware definitions and adjusts callable signature docs for push middleware.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.37%. Comparing base (3af8d68) to head (50e07db).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #278      +/-   ##
============================================
- Coverage     98.38%   98.37%   -0.02%     
- Complexity      321      322       +1     
============================================
  Files            47       47              
  Lines           868      860       -8     
============================================
- Hits            854      846       -8     
  Misses           14       14              

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