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>

android/app/src/main/java/com/fabledsword/minstrel/api/ErrorCopy.kt

@@ -120,6 +120,8 @@ object ErrorCopy {
         "album_mbid_missing" to "This track has no Lidarr album to remove.",
         "request_not_pending" to "This request is no longer pending.",
         "request_not_found" to "That request no longer exists.",
+        "not_followable" to "Various Artists and MusicBrainz placeholders can't be followed.",
+        "profile_not_found" to "That release-type profile no longer exists.",
         "track_not_found" to "That track no longer exists.",
         "library_not_writable" to "The music library isn't writable by the server.",
         "file_delete_failed" to "The file couldn't be deleted.",

android/app/src/main/java/com/fabledsword/minstrel/models/wire/DiscoverWire.kt

@@ -94,10 +94,10 @@ data class SnoozeSuggestionBody(
 @Serializable
 data class CreateRequestBody(
     val kind: String,
-    @SerialName("lidarr_artist_mbid") val artistMbid: String,
+    @SerialName("artist_mbid") val artistMbid: String,
     @SerialName("artist_name") val artistName: String,
-    @SerialName("lidarr_album_mbid") val albumMbid: String? = null,
+    @SerialName("album_mbid") val albumMbid: String? = null,
     @SerialName("album_title") val albumTitle: String? = null,
-    @SerialName("lidarr_track_mbid") val trackMbid: String? = null,
+    @SerialName("track_mbid") val trackMbid: String? = null,
     @SerialName("track_title") val trackTitle: String? = null,
 )