feat(requests): show ingest progress while requests are in flight

After Lidarr accepts a request the local reconciler imports albums and
tracks as they arrive — but until the request hit 'completed' the
operator had no way to see "is anything happening?" The /requests and
/admin/requests rows now surface a live progress line whenever the
request's matched entity has children in our library.

Backend:
- New CountAlbumsByArtist + CountTracksByArtist sqlc queries.
- requestView gains imported_album_count and imported_track_count.
- New fillProgress helper computes them from the matched entity:
  - kind=artist  → counts albums + tracks under matched_artist_id
  - kind=album   → counts tracks under matched_album_id
  - kind=track   → 1 once matched_track_id is set
  N+1 in the list endpoints; acceptable at admin scale.
- handleListRequests, handleGetRequest, and handleListAdminRequests
  populate the new fields on every response.

Frontend:
- LidarrRequest TS type extended with the two counters.
- Both the operator's /requests page and the admin /admin/requests
  page render an accent-colored line under the row meta when at
  least one counter is non-zero, e.g.:
    Artist:  "5 albums · 47 tracks ingested"
    Album:   "12 tracks ingested"
    Track:   "Track ingested"
- Updated test fixtures to include the new required fields.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/api/admin_requests.go

@@ -9,6 +9,7 @@ import (
 	"github.com/go-chi/chi/v5"
 
 	"git.fabledsword.com/bvandeusen/minstrel/internal/auth"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/db/dbq"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/lidarr"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/lidarrrequests"
 )
@@ -55,9 +56,12 @@ func (h *handlers) handleListAdminRequests(w http.ResponseWriter, r *http.Reques
 		return
 	}
 
+	q := dbq.New(h.pool)
 	out := make([]requestView, 0, len(rows))
 	for _, row := range rows {
-		out = append(out, requestViewFrom(row))
+		v := requestViewFrom(row)
+		fillProgress(r.Context(), q, row, &v)
+		out = append(out, v)
 	}
 	writeJSON(w, http.StatusOK, out)
 }