Fix migration class name for model names with acronyms (e.g. model:AIModel)

[Saidbek]

Summary

Fixes uninitialized constant CreateAiModels when running the install generator with model names that use acronyms (e.g. model:AIModel). The migration class is now derived from the table name (and thus the filename), matching Rails’ behavior, and the change is applied to all four create_* migration templates.

#629

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.13%. Comparing base (f9b1370) to head (d00ae56).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #640   +/-   ##
=======================================
  Coverage   80.13%   80.13%           
=======================================
  Files         113      113           
  Lines        5095     5095           
  Branches     1307     1307           
=======================================
  Hits         4083     4083           
  Misses       1012     1012           

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