feat(Flag Dependency): Index flag references

[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

Contributes to #8412

This implements the support foundation for flag dependency in the Management API:

• Flag references (prerequisite) are now indexed upon changes to segments.
• Segments are now validated against flag circular dependency:
  • When updating rules;
  • When updating overrides;
  • When drafting segment changes (Segment Change Requests).

How did you test this code?

Functional tests included.

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3 Skipped Deployments

Project	Deployment	Actions	Updated
docs	Ignored		Sep 14, 2026 2:24pm UTC
flagsmith-frontend-preview	Ignored		Sep 14, 2026 2:24pm UTC
flagsmith-frontend-staging	Ignored		Sep 14, 2026 2:24pm UTC

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