infra(prod): Throttle segment endpoints

[khvn26]

Thanks for submitting a PR! Please check the boxes below:

• [ ] I have added information to docs/ if required so people know about the feature!
• [x] I have filled in the "Changes" section below?
• [x] I have filled in the "How did you test this code" section below?
• [x] I have used a Conventional Commit title for this Pull Request

Changes

This adds a default 30/minute throttle for /api/v1/segments/* endpoints, and throttles them at a rate of 5/minute for SaaS prod.

How did you test this code?

N/A

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3 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ignored			Dec 11, 2025 5:56pm
flagsmith-frontend-preview	Ignored			Dec 11, 2025 5:56pm
flagsmith-frontend-staging	Ignored			Dec 11, 2025 5:56pm

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Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-6400	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-6400	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-e2e:pr-6400	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-6400	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith:pr-6400	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6400	Finished :white_check_mark:	Results :white_check_mark:

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Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 98.06%. Comparing base (9e584f1) to head (08a9e41). :warning: Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6400   +/-   ##
=======================================
  Coverage   98.06%   98.06%           
=======================================
  Files        1289     1289           
  Lines       46293    46294    +1     
=======================================
+ Hits        45395    45396    +1     
  Misses        898      898           

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[matthewelwell]

@khvn26 @gagantrivedi is this superseded now by #6401 ?

[khvn26]

Yes, closing for now.