fix(Local): Fix make install

[emyller]

• I have read the Contributing Guide.
• I have added information to docs/ if required so people know about the feature.
• I have filled in the "Changes" section below.
• I have filled in the "How did you test this code" section below.

Changes

Require uv, and fix make install in the api directory:

• python unavailable in CLI: on MacOS, only python3 is linked by default.
• python -m pip is broken os OS-level Python installation. See why.

How did you test this code?

$ git clone git@github.com:Flagsmith/flagsmith.git
$ cd flagsmith/api
$ make install  # works

On MacOS, and in Linux too.

[vercel]

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	Jun 18, 2026 3:52pm
flagsmith-frontend-preview	Ignored	Preview	Jun 18, 2026 3:52pm
flagsmith-frontend-staging	Ignored	Preview	Jun 18, 2026 3:52pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.58%. Comparing base (40323e3) to head (13eeb46).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7808   +/-   ##
=======================================
  Coverage   98.58%   98.58%           
=======================================
  Files        1465     1465           
  Lines       56889    56889           
=======================================
  Hits        56082    56082           
  Misses        807      807           

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-7808	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-7808	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-7808	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-7808	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-7808	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-7808	Finished ✅	Results ✅

[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 41.3 seconds
 609d6d4
 🔄 Run: #17643 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 45.2 seconds
 609d6d4
 🔄 Run: #17643 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 1 failed

Details

 1 test across 1 suite
 48.7 seconds
 609d6d4
 📦 Artifacts: View test results and HTML report
🔄 Run: #17643 (attempt 1)

Failed tests

firefox › tests/project-permission-test.pw.ts › Project Permission Tests › Project-level permissions control access to features, environments, audit logs, and segments @enterprise

### Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 4.4 seconds
 13eeb46
 🔄 Run: #17644 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 35.2 seconds
 13eeb46
 🔄 Run: #17644 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 1 failed

Details

 1 test across 1 suite
 49.7 seconds
 13eeb46
 📦 Artifacts: View test results and HTML report
🔄 Run: #17644 (attempt 1)

Failed tests

firefox › tests/project-permission-test.pw.ts › Project Permission Tests › Project-level permissions control access to features, environments, audit logs, and segments @enterprise

### Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 37.3 seconds
 609d6d4
 🔄 Run: #17643 (attempt 2)

[github-actions]

Visual Regression

19 screenshots compared. See report for details.
View full report

[khvn26]

A couple questions.

[khvn26]

LGTM