fix(Segments): Improve data model around live segments

[emyller]

Closes #5825

Changes

• [x] Make Segment.version_of = null the indication for a live segment

Implementation Notes

[!WARNING] Migration 0031_set_version_of_to_null_for_canonical_segments:

• Migrates canonical segments from version_of=self to version_of=NULL
• May block during deployment depending on segment count
• Follows same pattern as migration 0023 which originally set version_of=id

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3 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ignored	Preview		Nov 11, 2025 10:26pm
flagsmith-frontend-preview	Ignored	Preview		Nov 11, 2025 10:26pm
flagsmith-frontend-staging	Ignored	Preview		Nov 11, 2025 10:26pm

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Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-6275	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-6275	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-6275	Finished :white_check_mark:	Results :white_check_mark:

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 98.02%. Comparing base (ec45a23) to head (d2729ac).

Additional details and impacted files

@@                            Coverage Diff                            @@
##           refactor/segment-change-requests-cleanup    #6275   +/-   ##
=========================================================================
  Coverage                                     98.02%   98.02%           
=========================================================================
  Files                                          1280     1281    +1     
  Lines                                         45399    45401    +2     
=========================================================================
+ Hits                                          44501    44503    +2     
  Misses                                          898      898           

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