Fix self-host integration routes and API key limits

[RhysSullivan]

Summary

• add self-host /integrations routes and redirect legacy /sources routes
• disable Better Auth's default API-key request limit for self-host keys
• add a regression test covering repeated API-key authentication

Verification

• bun run --cwd apps/host-selfhost test src/auth/better-auth.test.ts
• bun run --cwd apps/host-selfhost typecheck
• bun run --cwd apps/host-selfhost build

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	executor-marketing	d0397ef	Commit Preview URL Branch Preview URL	Jun 09 2026, 04:47 AM