feat: import with verification, and a Wanted view of its own (M502 #5522)

A finished download is checked against MusicBrainz before anything is
filed: the files are paired with an edition's tracks by position or path,
and AcoustID, tag ids, lengths and titles say whether it is the album.
What is the album is copied into the library as
Artist/Album (Year)/Artist - Album - NN - Title, tagged with Picard's
MusicBrainz ids, and scanned; the download keeps seeding. What is not is
refused: set aside, removed from the client, and the album searched for
again. A download the check cannot settle waits for a person, who imports
it anyway or refuses it. Tracks the library already holds are skipped.

The wanted list leaves Admin for a top-level Wanted view, admin-only and
web-only, with tabs for Wanted, Activity (downloads and their imports,
the ones needing a person first), Missing files, Held, Following (with the
release-type profiles, moved off Integrations) and Blocked. The search
settings gain "File new music into" when the library has several folders.

The search pass logs why each failed search failed.

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

internal/db/dbq/models.go

@@ -225,6 +225,7 @@ type AcquisitionSetting struct {
 	LastPassAt          pgtype.Timestamptz
 	LastPass            []byte
 	UpdatedAt           pgtype.Timestamptz
+	ImportRoot          string
 }
 
 type Album struct {
@@ -431,23 +432,33 @@ type GeneralLikesArtist struct {
 }
 
 type Grab struct {
-	ID        pgtype.UUID
-	WantID    pgtype.UUID
-	InfoHash  string
-	Name      string
-	Key       string
-	Indexer   string
-	Source    string
-	Client    string
-	SavePath  string
-	Quality   string
-	Origin    string
-	Forced    bool
-	GrabbedBy pgtype.UUID
-	GrabbedAt pgtype.Timestamptz
-	EndedAt   pgtype.Timestamptz
-	EndReason string
-	EndDetail string
+	ID              pgtype.UUID
+	WantID          pgtype.UUID
+	InfoHash        string
+	Name            string
+	Key             string
+	Indexer         string
+	Source          string
+	Client          string
+	SavePath        string
+	Quality         string
+	Origin          string
+	Forced          bool
+	GrabbedBy       pgtype.UUID
+	GrabbedAt       pgtype.Timestamptz
+	EndedAt         pgtype.Timestamptz
+	EndReason       string
+	EndDetail       string
+	Progress        float32
+	ImportState     string
+	ImportReason    string
+	ImportDetail    []byte
+	ImportForced    bool
+	ImportAttempts  int32
+	ImportUpdatedAt pgtype.Timestamptz
+	ImportedAt      pgtype.Timestamptz
+	ImportedFiles   int32
+	Destination     string
 }
 
 type LibraryChange struct {