feat: move Apps from admin to main tab bar with container config

- Apps tab visible to OPERATOR+ (hidden for VIEWER), scoped by
  sidebar app selection and environment filter
- List view: DataTable with name, environment, updated, created columns
- Detail view: deployments across all envs, version upload with
  per-env deploy target, container config form (resources, ports,
  custom env vars) with explicit Save
- Memory reserve field disabled for non-production environments
  with info hint
- Admin sidebar sorted alphabetically, Applications entry removed
- Old admin AppsPage deleted

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/api/queries/admin/environments.ts

@@ -7,6 +7,7 @@ export interface Environment {
   displayName: string;
   production: boolean;
   enabled: boolean;
+  defaultContainerConfig: Record<string, unknown>;
   createdAt: string;
 }