Add QueueScheduler import/export workflow

[dereuromark]

Summary

• add schedule export as JSON from the scheduler row view
• add a dedicated import page that preloads the add form for review before saving
• open interval help in a new tab and make scheduler list ordering deterministic by name

Notes

• scheduler rows index default order: name ASC
• scheduler dashboard default order: name ASC

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 4.16667% with 92 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.18%. Comparing base (d87281c) to head (a1bf70e).

Files with missing lines	Patch %	Lines
src/Controller/Admin/SchedulerRowsController.php	3.15%	92 Missing ⚠️
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Additional details and impacted files

@@             Coverage Diff              @@
##             master      #46      +/-   ##
============================================
- Coverage     84.27%   78.18%   -6.10%     
- Complexity      457      492      +35     
============================================
  Files            13       13              
  Lines          1170     1265      +95     
============================================
+ Hits            986      989       +3     
- Misses          184      276      +92     

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