feat: search and grab — music release names, a quality ladder, a paced search schedule and one live grab per want (M502 #5521)

- internal/release: reads a release name (format, bitrate, bit depth and
  sample rate, source, year, video, discography) and judges it against the
  album wanted: the artist and title must be in it; video rips,
  discographies, other versions (drumless, instrumental, karaoke, remix,
  live unless the album is live…) and singles or EPs for an album are
  refused. Quality tiers on Lidarr's ladder; a .torrent's file list is read
  for format, video files and a track count short of the album.
- internal/acquire: fan-out across every search source with a narrowed
  search kept, a process-wide pacer per source, every candidate judged and
  kept with its reasons, and the grab: one live grab per want, tie-broken
  (a person's grab beats the schedule's; a better release replaces a worse
  one unless it is nearly done). Each download lands in its own folder
  under the client's downloads folder.
- internal/wanted: the search schedule, every ten minutes, never-searched
  first, then requests, missing files and followed artists, taking the
  best release when auto-grab is on (the default).
- Migration 0082: acquisition_settings (auto-grab, interval, allowed
  qualities seeded from Lidarr's "Any"), want search columns,
  want_candidates, grabs, release_blocks.
- Web: the Wanted page shows each want's last search, a Search button and
  every release found with its verdict (Grab, Grab anyway, Never this one,
  Allow again). Integrations gains "Searching and grabbing".

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

internal/db/dbq/models.go

@@ -217,6 +217,16 @@ type AcquisitionService struct {
 	UpdatedAt        pgtype.Timestamptz
 }
 
+type AcquisitionSetting struct {
+	ID                  bool
+	AutoGrab            bool
+	SearchIntervalHours int32
+	AllowedQualities    []string
+	LastPassAt          pgtype.Timestamptz
+	LastPass            []byte
+	UpdatedAt           pgtype.Timestamptz
+}
+
 type Album struct {
 	ID                     pgtype.UUID
 	Title                  string
@@ -420,6 +430,26 @@ type GeneralLikesArtist struct {
 	LikedAt  pgtype.Timestamptz
 }
 
+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
+}
+
 type LibraryChange struct {
 	ID         int64
 	EntityType string
@@ -652,6 +682,16 @@ type RegistrationSetting struct {
 	Mode string
 }
 
+type ReleaseBlock struct {
+	InfoHash  string
+	Name      string
+	Reason    string
+	Detail    string
+	WantID    pgtype.UUID
+	BlockedBy pgtype.UUID
+	BlockedAt pgtype.Timestamptz
+}
+
 type ReleaseTypeProfile struct {
 	ID             pgtype.UUID
 	Name           string
@@ -976,6 +1016,33 @@ type Want struct {
 	FulfilledAt      pgtype.Timestamptz
 	CreatedAt        pgtype.Timestamptz
 	UpdatedAt        pgtype.Timestamptz
+	SearchedAt       pgtype.Timestamptz
+	SearchOutcome    string
+	SearchConsidered int32
+	BestRelease      string
+	BestVerdict      string
+	SearchError      string
+}
+
+type WantCandidate struct {
+	WantID     pgtype.UUID
+	Key        string
+	Name       string
+	InfoHash   string
+	Indexer    string
+	Source     string
+	SizeBytes  int64
+	Seeders    int32
+	FilesCount int32
+	Format     string
+	Quality    string
+	Year       int32
+	Verdict    string
+	Reason     string
+	Reasons    []byte
+	FoldedFrom []string
+	Rank       int32
+	SearchedAt pgtype.Timestamptz
 }
 
 type YouMightLikeAlbum struct {