feat(web): add API client modules for Lidarr, requests, admin

T13 of the M5a Lidarr plan. Three new client modules wrap api.get/post/put/del
helpers and the existing TanStack Query qk namespace:

  lidarr.ts   - searchLidarr() + createLidarrSearchQuery()
  requests.ts - createRequest, listMyRequests, getRequest, cancelRequest;
                createMyRequestsQuery(); cancel goes through apiFetch
                directly because the backend returns the cancelled row body
                (api.del's return type is fixed to null).
  admin.ts    - getLidarrConfig, putLidarrConfig, testLidarrConnection,
                listQualityProfiles, listRootFolders, listAdminRequests,
                approveRequest, rejectRequest; query factories for each
                read; quality profiles + root folders take an enabled prop
                so the call site decides when Lidarr is configured.

Shared LidarrRequestStatus / LidarrRequestKind enums and request/config/
search-result shapes added to types.ts. Per-module helpers (CreateRequestParams)
stay in their module files. testLidarrConnection returns a discriminated union
({ok:true,version} | {ok:false,error}) and never throws on ok:false so the
SPA can render either branch.

qk extended with lidarrSearch, myRequests, lidarrConfig,
lidarrQualityProfiles, lidarrRootFolders, adminRequests.

Tests mirror likes.test.ts (vi.mock('./client')) and cover URL construction,
query-param encoding, body shapes, the not-ok testLidarrConnection branch,
and qk additions. 32 new tests, 217 total passing.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/src/lib/api/queries.ts

@@ -19,6 +19,15 @@ export const qk = {
   likedTracks:   ()          => ['likedTracks'] as const,
   likedAlbums:   ()          => ['likedAlbums'] as const,
   likedArtists:  ()          => ['likedArtists'] as const,
+  // Lidarr / requests / admin.
+  lidarrSearch:          (q: string, kind: string) =>
+    ['lidarrSearch', { q, kind }] as const,
+  myRequests:            () => ['myRequests'] as const,
+  lidarrConfig:          () => ['lidarrConfig'] as const,
+  lidarrQualityProfiles: () => ['lidarrQualityProfiles'] as const,
+  lidarrRootFolders:     () => ['lidarrRootFolders'] as const,
+  adminRequests:         (status?: string) =>
+    ['adminRequests', { status: status ?? 'pending' }] as const,
 };
 
 export function createArtistsQuery(sort: ArtistSort) {