Backend: Add feature flags

[Smartdevs17]

Problem

No way to toggle features.

Proposed Solution

Add feature flag system.

Acceptance Criteria

• Define feature flags
• Toggle via config
• Track usage
• Gradual rollout

Technical Notes

• Files: New backend/src/config/featureFlags.ts

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[gidson5]

@gidson5 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

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