fix: add throttle to flag analytics endpoint

[matthewelwell]

Changes

Add throttle to flag analytics endpoint (see related PR here)

How did you test this code?

N/a

[vercel]

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3 Skipped Deployments

Project	Deployment	Review	Updated (UTC)
docs	Ignored		Jan 2, 2026 6:25pm
flagsmith-frontend-preview	Ignored		Jan 2, 2026 6:25pm
flagsmith-frontend-staging	Ignored		Jan 2, 2026 6:25pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-6454	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-6454	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-6454	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-6454	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6454	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6454	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.07%. Comparing base (64a216a) to head (d2249a9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6454   +/-   ##
=======================================
  Coverage   98.07%   98.07%           
=======================================
  Files        1294     1294           
  Lines       46533    46535    +2     
=======================================
+ Hits        45635    45637    +2     
  Misses        898      898           

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