Update routing for admin channels and shows: add index routes for channels and shows, refactor components to use Outlet for nested routing, and enhance type definitions for new routes in the routing structure.

frontend/src/routes/admin/channels.index.tsx

@@ -0,0 +1,4 @@
+import { createFileRoute } from '@tanstack/react-router'
+import { ChannelsPanel } from '@/features/admin/channels/ChannelsPanel'
+
+export const Route = createFileRoute('/admin/channels/')({ component: ChannelsPanel })

frontend/src/routes/admin/channels.tsx

@@ -1,4 +1,4 @@
-import { createFileRoute } from '@tanstack/react-router'
-import { ChannelsPanel } from '@/features/admin/channels/ChannelsPanel'
+import { createFileRoute, Outlet } from '@tanstack/react-router'
 
-export const Route = createFileRoute('/admin/channels')({ component: ChannelsPanel })
+// Лейаут для /admin/channels/*: список — в index-роуте, деталь — в channels.$channelId.
+export const Route = createFileRoute('/admin/channels')({ component: () => <Outlet /> })

frontend/src/routes/admin/shows.index.tsx

@@ -0,0 +1,4 @@
+import { createFileRoute } from '@tanstack/react-router'
+import { ShowsPanel } from '@/features/admin/shows/ShowsPanel'
+
+export const Route = createFileRoute('/admin/shows/')({ component: ShowsPanel })

frontend/src/routes/admin/shows.tsx

@@ -1,4 +1,4 @@
-import { createFileRoute } from '@tanstack/react-router'
-import { ShowsPanel } from '@/features/admin/shows/ShowsPanel'
+import { createFileRoute, Outlet } from '@tanstack/react-router'
 
-export const Route = createFileRoute('/admin/shows')({ component: ShowsPanel })
+// Лейаут для /admin/shows/*: список — в index-роуте, деталь — в shows.$showId.
+export const Route = createFileRoute('/admin/shows')({ component: () => <Outlet /> })