feat: Minstrel no longer talks to Lidarr: its connection, Delete via Lidarr and the unmonitor options are gone, and the track reports are plain quarantine (M502 #5525)

Migration 0091 drops lidarr_config and renames the quarantine tables, types,
indexes and the history column off the Lidarr name. The Integrations Lidarr
card, the Reports "Delete via Lidarr" action, the merge and remove-track
unmonitor options, the Lidarr audit actions and error codes go, on the
server, web and Android. The README describes acquisition as it is now.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/api/admin_tracks.go

@@ -3,7 +3,6 @@ package api
 import (
 	"errors"
 	"net/http"
-	"strconv"
 
 	"github.com/go-chi/chi/v5"
 
@@ -11,27 +10,22 @@ import (
 	"git.fabledsword.com/bvandeusen/minstrel/internal/tracks"
 )
 
-// removeTrackResponse is the wire shape from spec §5 (M7 #372). The three
+// removeTrackResponse is the wire shape from spec §5 (M7 #372). The two
 // optional fields are omitted unless the corresponding cleanup actually
 // happened, so the response stays minimal in the common case.
 type removeTrackResponse struct {
-	DeletedTrackID        string  `json:"deleted_track_id"`
-	DeletedAlbumID        *string `json:"deleted_album_id,omitempty"`
-	DeletedArtistID       *string `json:"deleted_artist_id,omitempty"`
-	LidarrUnmonitorFailed *bool   `json:"lidarr_unmonitor_failed,omitempty"`
+	DeletedTrackID  string  `json:"deleted_track_id"`
+	DeletedAlbumID  *string `json:"deleted_album_id,omitempty"`
+	DeletedArtistID *string `json:"deleted_artist_id,omitempty"`
 }
 
-// handleRemoveTrack implements DELETE /api/admin/tracks/{id}?unmonitor=true|false.
+// handleRemoveTrack implements DELETE /api/admin/tracks/{id}.
 //
 // Admin-only (gated by auth.RequireAdmin on the /admin route group). Deletes the
 // file, then the DB row, and runs the album/artist cascade tidy-up — and deletes
-// nothing at all when the file cannot be removed (#3918). When
-// unmonitor=true and the track has an mbid, also calls Lidarr.UnmonitorTrack
-// — failure there is non-fatal (the destructive part already completed) and
-// surfaces as `lidarr_unmonitor_failed: true` in the success envelope.
+// nothing at all when the file cannot be removed (#3918).
 //
-// Per spec §5, Lidarr-side errors during the unmonitor step do NOT map to
-// wire error codes. The codes this handler emits are not_found,
+// The codes this handler emits are not_found,
 // library_not_writable (409) and file_delete_failed when the file could not be
 // removed, server_error, plus the auth codes the middleware emits upstream.
 func (h *handlers) handleRemoveTrack(w http.ResponseWriter, r *http.Request) {
@@ -46,13 +40,6 @@ func (h *handlers) handleRemoveTrack(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	unmonitor := false
-	if v := r.URL.Query().Get("unmonitor"); v != "" {
-		if parsed, err := strconv.ParseBool(v); err == nil {
-			unmonitor = parsed
-		}
-	}
-
 	// Defensive: RequireUser+RequireAdmin should have run upstream. If
 	// we got here without a user in context the routing is broken.
 	admin, ok := requireUser(w, r)
@@ -60,9 +47,7 @@ func (h *handlers) handleRemoveTrack(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	deletedAlbum, deletedArtist, lidarrUnmonitorFailed, err := h.tracks.RemoveTrack(
-		r.Context(), trackID, admin.ID, unmonitor,
-	)
+	deletedAlbum, deletedArtist, err := h.tracks.RemoveTrack(r.Context(), trackID, admin.ID)
 	if err != nil {
 		if errors.Is(err, tracks.ErrNotFound) {
 			writeErr(w, &apierror.Error{Status: http.StatusNotFound, Code: "not_found", Message: "track not found"})
@@ -87,13 +72,5 @@ func (h *handlers) handleRemoveTrack(w http.ResponseWriter, r *http.Request) {
 		s := uuidToString(*deletedArtist)
 		resp.DeletedArtistID = &s
 	}
-	// Only emit the flag when unmonitor was requested AND it failed.
-	// Avoids "false" cluttering the wire when the operator didn't ask
-	// for an unmonitor in the first place.
-	if unmonitor && lidarrUnmonitorFailed {
-		t := true
-		resp.LidarrUnmonitorFailed = &t
-	}
-
 	writeJSON(w, http.StatusOK, resp)
 }