Remove integrations route ownership

[jeevanpillay]

Summary

• Remove stale /integrations and /integrations/:path* ownership from apps/app/microfrontends.json.
• Add negative assertions so the old www MFE table no longer claims integrations routes.

Stack

• Depends on Remove pitch deck route #812, which depends on Add TanStack Start marketing app #811.

Test Plan

• pnpm --filter @lightfast/app exec vitest run src/__tests__/microfrontends-config.test.ts
• pnpm --filter @lightfast/app typecheck

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Project	Deployment	Actions	Updated (UTC)
lightfast-app	Error		Jun 4, 2026 8:05am
lightfast-mcp	Ready	Preview, Comment	Jun 4, 2026 8:05am

2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
lightfast-platform	Skipped		Jun 4, 2026 8:05am
lightfast-www	Skipped		Jun 4, 2026 8:05am

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[jeevanpillay]

Folded this route-ownership cleanup into #811 so the migration lands as one PR.