[app] Enable Self Hosted Support

[JaspreetSandhu]

Enable support for Self-Hosted Mode via env vars.

• Added IS_SELF_HOSTED_MODE flag
• Disable NavBar prompt to "Get Started with Cloud"
• Bypass required multi-tenant auth

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0219acc

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[vercel]

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