Complete plugin-driven Admin UI navigation; remove FALLBACK_PAGES and PLUGIN_VIEW_COMPONENTS

[Copilot]

Admin UI navigation was split between a hardcoded FALLBACK_PAGES static list, a PLUGIN_VIEW_COMPONENTS map, and a series of activeView === conditionals in AppLayout. Core views were not plugin-aware, so the nav/view system had two separate code paths. This unifies them: all navigation is now sourced exclusively from /api/v1/admin/plugins.

Backend

• plugin/admincore — new NativePlugin declaring UIPages for all 9 core admin views (Dashboard, Editor, Marketplace, Templates, Environments, Settings, Executions, Logs, Events). Registered via init() + RegisterNativePluginFactory, auto-enabled at startup alongside storebrowser and docmanager.
• cmd/server/main.go — blank import to trigger admincore registration.

Frontend

• pluginStore.ts — deleted FALLBACK_PAGES entirely. deriveEnabledPages now uses only plugin-provided pages; initial enabledPages is [].
• App.tsx — replaced the limited PLUGIN_VIEW_COMPONENTS (3 entries, plugin-only) with a unified VIEW_REGISTRY covering all 12 views. Removed all hardcoded activeView === 'dashboard' etc. content-area conditionals. AppLayout now dispatches via a single lookup:

const page = enabledPages.find((p) => p.id === activeView);
const ViewComponent = VIEW_REGISTRY[activeView];
if (ViewComponent) return <ViewComponent />;
if (page?.template) return <TemplatePage page={page} />;

• Added LogsView and EventsView as proper named wrapper components (previously inline JSX).

Tests

• AppNav.test.tsx — explicitly populates enabledPages with CORE_PAGES matching admincore output, removing the implicit dependency on the now-deleted FALLBACK_PAGES default.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Complete Plugin-Driven Admin UI Navigation and Remove Fallbacks</issue_title>
<issue_description>Replace all hardcoded navigation/views in Admin UI with plugin-driven components, killing the FALLBACK_PAGES array and PLUGIN_VIEW_COMPONENTS map.

Tasks

• Refactor core admin views (Dashboard, Editor, Executions, Logs, Marketplace, Templates, Environments, Settings) into NativePlugins.
• Each plugin declares UIPages and RegistersRoutes.
• React UI builds navigation solely from /api/v1/admin/plugins.
• Remove all hardcoded view conditionals from App.tsx.
• Remove FALLBACK_PAGES and pluginStore fallback logic.
• Document required plugin conventions for UI components (registry autoload pattern).

Acceptance

• Admin UI navigation and views entirely driven by enabled plugins.
• No static fallback logic.

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Copilot Agent assigned (can be tackled in parallel).

Linked to broader UI refactor effort.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Complete Plugin-Driven Admin UI Navigation and Remove Fallbacks #35

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