feat(ui): reconnect registry-admin under integration hub [SPRINT-023]

Mount registry-admin routes under canonical /ops/integrations (and
/setup/integrations) with plans list, editor, and audit flows reachable
from integration-hub entry points.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/features/checked/web/registry-admin-integration-routes.md

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+# Registry Admin Integration Route Reconnection
+
+## Module
+Web
+
+## Status
+IMPLEMENTED
+
+## Sprint
+SPRINT_20260308_023_FE_unreachable_registry_admin_route
+
+## Description
+Reconnected the disconnected registry-admin route family under the canonical integration hub. The registry-admin capability is mounted as a child of the integration shell, preserving integration-hub context and preventing a standalone product branch.
+
+## Canonical URL Contract
+Accessible via both Ops and Setup parent paths:
+- `/ops/integrations/registry-admin` - Registry plan list (via Ops)
+- `/setup/integrations/registry-admin` - Registry plan list (via Setup)
+- `.../registry-admin/plans` - Plan list (explicit)
+- `.../registry-admin/plans/new` - Create plan
+- `.../registry-admin/plans/:planId` - Edit plan
+- `.../registry-admin/audit` - Audit trail
+
+## Implementation Details
+- **Route file**: `src/Web/StellaOps.Web/src/app/features/integration-hub/integration-hub.routes.ts`
+  - Added `registry-admin` child route with `loadChildren` before the catch-all `:integrationId` route
+- **Feature routes updated**:
+  - `src/Web/StellaOps.Web/src/app/features/registry-admin/registry-admin.routes.ts` - Added breadcrumb data, title, sprint ref
+- **Tests**: `src/Web/StellaOps.Web/src/app/routes/integration-hub.routes.spec.ts`
+
+## Key Decisions
+- Registry admin is treated as an integration-management capability, not a standalone product
+- Mounted before the catch-all `:integrationId` route to prevent path conflicts
+- Accessible from both `/ops/integrations/` and `/setup/integrations/` parent paths since integration-hub routes are shared
+- Navigation into registry-admin preserves the integration shell context