Refresh admin navigation and resource search

Refresh the server-rendered administration interface so operators navigate by recognizable resource names rather than internal IDs. Scope: - Add an organization destination page with clear links into its users, projects, policies, and audit history. - Make organization references actionable across relevant dashboard, list, and detail views. - Replace organization-ID entry in project creation and other exposed organization-driven workflows with permission-scoped, server-rendered search/selection that remains usable without JavaScript. - Improve list search semantics, selected-context visibility, responsive layout, focus states, and overall admin visual hierarchy. - Keep all new user-facing text localized in English, Norwegian Bokmål, and Danish. Acceptance criteria: - An authorized administrator can find an organization by name/domain and create a project in it without copying its ID. - Organization links lead to a useful permission-scoped organization page and preserve understandable context when navigating to related resources. - Existing no-JavaScript administration flows, authorization, CSRF, and pagination behavior remain intact. - The refreshed interface is keyboard-accessible, responsive, and validated by repository tests plus targeted browser inspection on the synthetic development fixture.