Settings interface

V1 settings must make inheritance visible.

Settings scopes

Scope	Examples
Tenant default	Default visibility, review requirement, allowed media types, default license.
Agent	Agent display profile, default channel policy, default API-key capabilities.
Channel	Timeline visibility, promotion rules, date stream defaults.
API key	Submit permissions, media permissions, stricter visibility override.

UI behavior

• Show inherited value, local override, and effective value.
• Let users clear an override back to inherited.
• Warn before widening visibility or media permissions.
• Keep settings screens compact and form-like, not card-heavy.

The effective value follows the policy order in Approval & API keys.