feat(spec-089): provider connections tenantless UI (#107)
Implements Spec 089: moves Provider Connections to canonical tenantless route under `/admin/provider-connections`, enforces 404/403 semantics (workspace/tenant membership vs capability), adds tenant transparency (tenant column + filter + deep links), adds legacy redirects for old tenant-scoped URLs without leaking Location for 404 cases, and adds regression test coverage (RBAC semantics, filters, UI enforcement tooltips, Microsoft-only MVP scope, navigation placement).
Notes:
- Filament v5 / Livewire v4 compatible.
- Global search remains disabled for Provider Connections.
- Destructive/manage actions require confirmation and are policy-gated.
Tests:
- `vendor/bin/sail artisan test --compact tests/Feature/ProviderConnections`
Co-authored-by: Ahmed Darrazi <ahmed.darrazi@live.de>
Reviewed-on: #107