[Admin] Add ability to show/hide content related to BE

[ya092]

Overview

Introduce an adminApiEnabled feature flag to control access to Admin API-dependent functionality throughout the application.

The flag is derived from the presence of DIAL_ADMIN_API_URL and ensures that Admin API features are consistently hidden, disabled, and inaccessible when the Admin API is not configured.

Changes

Feature Flag

• Add adminApiEnabled to FeatureFlags.
• Set the flag based on whether DIAL_ADMIN_API_URL is configured.

Menu Configuration

• Hide the following menu groups when Admin API is disabled:
  • Entities
  • Builders
  • Access Management
• Hide the Activity Audit menu item when Admin API is disabled.
• Preserve the existing behavior and independence of:
  • deploymentsEnabled
  • evaluationEnabled
  • analyticsEnabled
  • analyticsConversationsEnabled

Menu Actions

• Hide Import config and Export config when Admin API is disabled.
• Apply the same restriction to both expanded and collapsed menu action bars.
• Keep System properties available regardless of the Admin API flag.
• Preserve the existing isReadOnlyAdmin restrictions.

Footer and Status Polling

• Disable application status polling when Admin API is disabled.
• Disable core version polling when Admin API is disabled.
• Prevent both the initial API calls and recurring setInterval calls from being started.
• Hide the Footer when Admin API is disabled.

Route Guards

Add server-side route guards that redirect to the Home route when DIAL_ADMIN_API_URL is not configured.

The guard is added to the following Admin API-dependent routes:

Entities

• Models
• Applications
• Interceptors
• Toolsets
• Routes

Builders

• Adapters
• Application Runners
• Interceptor Templates

Access Management

• Roles
• Keys

Other Admin API functionality

• Activity Audit
• Import Config
• Export Config

Expected Behavior

When DIAL_ADMIN_API_URL is configured:

• All existing Admin API functionality remains available.
• Existing menu, footer, and polling behavior is preserved.

When DIAL_ADMIN_API_URL is not configured:

• Admin API-related navigation and actions are hidden.
• Admin API status/version polling is disabled.
• The Footer is hidden.
• Direct access to Admin API-dependent routes redirects to Home.

This provides consistent Admin API feature gating across the UI, background API calls, and server-side routing.