Add source control app sharing and onboarding flow

[omer-second]

Summary

• Add source control-backed app sharing across onboarding, workspace settings, available apps, and publish flows
• Introduce provider validation, permission checks, and workspace-scoped read/write handling for shared apps
• Update worker/runtime integration, app bundle sync, and supporting docs for the new flow

Testing

• Not run (not requested)
• Added and updated unit coverage for runtime registry and opencode model behavior
• Reviewed the affected onboarding, source control, and workspace routes for the new shared-app flow

[mintlify]

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Project	Status	Preview	Updated (UTC)
second-232e8a64	🟢 Ready	View Preview	Jul 2, 2026, 5:29 PM

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