feat: a wanted list — follow artists on release-type profiles; requests and re-acquisition become wants (M502 #5520)

Minstrel keeps its own list of what it is to get, keyed by MusicBrainz
release group. A want comes from an approved request, a new release by a
followed artist, or an album whose files went missing, and is held once the
library has a full edition of it.

- Migration 0081: release_type_profiles (Standard seeded: Album, EP,
  Single, studio only), follows, follow_seen_groups and wants.
  lidarr_requests becomes requests with plain *_mbid columns; approved
  album and track requests move onto the wanted list, approved artist
  requests become follows, and the library's album artists start out
  followed. missing_reacquisitions and the retry settings go.
- internal/wanted: follows are checked against MusicBrainz discographies
  daily. The first check sets a baseline, and only releases after it are
  wanted unless the follow asked for what already exists. Profiles filter
  by primary and secondary type, so live recordings stay out unless a
  profile ticks Live.
- internal/requests (was lidarrrequests): approving puts the request on
  the wanted list, and an artist request can be approved on a chosen
  profile. A request completes when its want is held.
- The re-acquisition sweeper wants a missing album back instead of asking
  Lidarr; searching for it is the search schedule's (#5521).
- Web: an admin Wanted page (Wanted, Missing files, Held, Following), a
  follow control on artist pages, a release-type profiles card on
  Integrations, "Approve on a profile" on Requests, and want state on
  Missing files. The artist detail API returns the artist's MBID.
- Android: the request body sends artist_mbid, album_mbid and track_mbid.

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

internal/api/admin_requests.go

@@ -7,12 +7,13 @@ import (
 	"strconv"
 
 	"github.com/go-chi/chi/v5"
+	"github.com/jackc/pgx/v5/pgtype"
 
 	"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"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/notifications"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/requests"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/wanted"
 )
 
 // validRequestStatuses is the set of allowed values for the ?status= param.
@@ -50,7 +51,7 @@ func (h *handlers) handleListAdminRequests(w http.ResponseWriter, r *http.Reques
 		limit = v
 	}
 
-	rows, err := h.lidarrRequests.ListByStatus(r.Context(), status, int32(limit))
+	rows, err := h.requests.ListByStatus(r.Context(), status, int32(limit))
 	if err != nil {
 		h.logger.Error("admin: list requests", "err", err)
 		writeAdminJSONErr(w, http.StatusInternalServerError, "server_error")
@@ -68,12 +69,15 @@ func (h *handlers) handleListAdminRequests(w http.ResponseWriter, r *http.Reques
 }
 
 // approveRequestBody is the optional JSON body for POST /api/admin/requests/:id/approve.
+// profile_id picks the release-type profile an artist request is followed
+// on; omitted, the default profile.
 type approveRequestBody struct {
-	QualityProfileID int    `json:"quality_profile_id"`
-	RootFolderPath   string `json:"root_folder_path"`
+	ProfileID string `json:"profile_id"`
 }
 
-// handleApproveRequest implements POST /api/admin/requests/:id/approve.
+// handleApproveRequest implements POST /api/admin/requests/:id/approve. The
+// request goes on the wanted list (M502 #5520): an album or track request
+// wants its album, an artist request follows the artist.
 func (h *handlers) handleApproveRequest(w http.ResponseWriter, r *http.Request) {
 	admin, ok := auth.UserFromContext(r.Context())
 	if !ok {
@@ -90,35 +94,25 @@ func (h *handlers) handleApproveRequest(w http.ResponseWriter, r *http.Request)
 	var body approveRequestBody
 	// Body is entirely optional; ignore decode errors.
 	_ = json.NewDecoder(r.Body).Decode(&body)
+	var profile pgtype.UUID
+	if body.ProfileID != "" {
+		if profile, ok = parseUUID(body.ProfileID); !ok {
+			writeAdminJSONErr(w, http.StatusBadRequest, "invalid_profile")
+			return
+		}
+	}
 
-	row, err := h.lidarrRequests.Approve(r.Context(), id, admin.ID, lidarrrequests.ApproveOverrides{
-		QualityProfileID: body.QualityProfileID,
-		RootFolderPath:   body.RootFolderPath,
-	})
+	row, err := h.requests.Approve(r.Context(), id, admin.ID, profile)
 	if err != nil {
 		switch {
-		case errors.Is(err, lidarrrequests.ErrLidarrDisabled):
-			writeAdminJSONErr(w, http.StatusServiceUnavailable, "lidarr_disabled")
-		case errors.Is(err, lidarrrequests.ErrDefaultsIncomplete):
-			writeAdminJSONErr(w, http.StatusBadRequest, "lidarr_defaults_incomplete")
-		case errors.Is(err, lidarrrequests.ErrNotFound):
+		case errors.Is(err, requests.ErrNotFound):
 			writeAdminJSONErr(w, http.StatusNotFound, "request_not_found")
-		case errors.Is(err, lidarrrequests.ErrNotPending):
+		case errors.Is(err, requests.ErrNotPending):
 			writeAdminJSONErr(w, http.StatusConflict, "request_not_pending")
-		case errors.Is(err, lidarr.ErrUnreachable):
-			writeAdminJSONErr(w, http.StatusServiceUnavailable, "lidarr_unreachable")
-		case errors.Is(err, lidarr.ErrAuthFailed):
-			writeAdminJSONErr(w, http.StatusServiceUnavailable, "lidarr_auth_failed")
-		case errors.Is(err, lidarr.ErrServerError):
-			// Lidarr itself 5xx'd — its response body is in err's wrapped
-			// message (see lidarr.readBodySnippet). Logged below for ops.
-			h.logger.Error("admin: approve request: lidarr 5xx", "err", err)
-			writeAdminJSONErr(w, http.StatusBadGateway, "lidarr_server_error")
-		case errors.Is(err, lidarr.ErrLookupFailed):
-			// Lidarr returned 4xx — usually "artist already exists" or
-			// "no metadata found." Log so ops can see the actual reason.
-			h.logger.Warn("admin: approve request: lidarr 4xx", "err", err)
-			writeAdminJSONErr(w, http.StatusBadGateway, "lidarr_rejected")
+		case errors.Is(err, wanted.ErrProfileNotFound):
+			writeAdminJSONErr(w, http.StatusBadRequest, "profile_not_found")
+		case errors.Is(err, wanted.ErrNotFollowable):
+			writeAdminJSONErr(w, http.StatusBadRequest, "not_followable")
 		default:
 			h.logger.Error("admin: approve request", "err", err)
 			writeAdminJSONErr(w, http.StatusInternalServerError, "server_error")
@@ -153,12 +147,12 @@ func (h *handlers) handleRejectRequest(w http.ResponseWriter, r *http.Request) {
 	var body rejectRequestBody
 	_ = json.NewDecoder(r.Body).Decode(&body)
 
-	row, err := h.lidarrRequests.Reject(r.Context(), id, admin.ID, body.Notes)
+	row, err := h.requests.Reject(r.Context(), id, admin.ID, body.Notes)
 	if err != nil {
 		switch {
-		case errors.Is(err, lidarrrequests.ErrNotFound):
+		case errors.Is(err, requests.ErrNotFound):
 			writeAdminJSONErr(w, http.StatusNotFound, "request_not_found")
-		case errors.Is(err, lidarrrequests.ErrNotPending):
+		case errors.Is(err, requests.ErrNotPending):
 			writeAdminJSONErr(w, http.StatusConflict, "request_not_pending")
 		default:
 			h.logger.Error("admin: reject request", "err", err)