Replace Segment with direct Mixpanel integration

[willyogo]

Summary

• replace the Segment analytics client with a direct Mixpanel loader plus queued identify, page, and track calls
• update security policies, dependencies, and privacy copy to align with Mixpanel-only analytics routing
• drop the Segment package since event routing no longer relies on the Segment SDK

Testing

• npm run lint (passes with existing unused variable warnings)

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Codex Task

[vercel]

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Project	Deployment	Review	Updated (UTC)
space-system	Ready	Preview, Comment	Jan 1, 2026 0:07am

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