feat(backend): Add generic API helper for transitions

[matmair]

This PR adds a generic viewset mixin that enables writing much more concise APIs when using FSM transitions - follow up to #12317

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Codecov Report

❌ Patch coverage is 84.00000% with 36 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.17%. Comparing base (5a73087) to head (399068d).

❌ Your patch check has failed because the patch coverage (82.52%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12693      +/-   ##
==========================================
- Coverage   87.23%   87.17%   -0.06%     
==========================================
  Files        1487     1488       +1     
  Lines      101393   101496     +103     
  Branches    11547    11524      -23     
==========================================
+ Hits        88448    88481      +33     
- Misses      12882    12953      +71     
+ Partials       63       62       -1     

Flag	Coverage Δ
backend	91.17% <84.00%> (-0.04%)	⬇️

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Components	Coverage Δ
Backend Apps	92.45% <83.48%> (-0.05%)	⬇️
Backend General	94.40% <82.52%> (-0.33%)	⬇️
Frontend	79.76% <ø> (-0.12%)	⬇️

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[matmair]

@SchrodingersGat @wolflu05 what do you think about this approach? I use it in some of my plugins, it was partially implemented automatically by Claude due to the high level of duplication in a model with a lot of transitions

[matmair]

@SchrodingersGat ready for review

[SchrodingersGat]

Can you also apply these helpers to the build model API endpoints?

[matmair]

Can you also apply these helpers to the build model API endpoints?

this new generic approach only applies to DRF viewsets, not GenericViews and the build APIs are not on viewsets yet so that would expand the scope of the PR quite a bit

[matmair]

i just found a potential information leak in this approach; must review options