feat(api): add /api/lidarr/search proxy with library/request enrichment

Implements GET /api/lidarr/search?q=&kind=artist|album|track. Validates
kind and q, loads lidarr_config per-request, calls the matching Lidarr
Lookup* method, enriches each result with in_library (EXISTS by MBID
against artists/albums/tracks) and requested (HasNonTerminalRequestForMBID),
and returns a normalized JSON array. Adds lidarrCfg field to handlers struct
and threads lidarrconfig.Service through Mount and server.Router.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/api/api.go

@@ -13,15 +13,16 @@ import (
 
 	"git.fabledsword.com/bvandeusen/minstrel/internal/auth"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/config"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/lidarrconfig"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/playevents"
 )
 
 // Mount attaches /api/* handlers to r. Public endpoints (login) are outside
 // RequireUser; everything else is gated by the middleware. The events writer
 // is shared with the Subsonic mount so /rest/scrobble feeds the same store.
-func Mount(r chi.Router, pool *pgxpool.Pool, logger *slog.Logger, events *playevents.Writer, recCfg config.RecommendationConfig) {
+func Mount(r chi.Router, pool *pgxpool.Pool, logger *slog.Logger, events *playevents.Writer, recCfg config.RecommendationConfig, lidarrCfg *lidarrconfig.Service) {
 	rng := rand.New(rand.NewSource(rand.Int63()))
-	h := &handlers{pool: pool, logger: logger, events: events, recCfg: recCfg, rng: rng.Float64}
+	h := &handlers{pool: pool, logger: logger, events: events, recCfg: recCfg, rng: rng.Float64, lidarrCfg: lidarrCfg}
 
 	r.Route("/api", func(api chi.Router) {
 		api.Post("/auth/login", h.handleLogin)
@@ -51,14 +52,17 @@ func Mount(r chi.Router, pool *pgxpool.Pool, logger *slog.Logger, events *playev
 			authed.Get("/likes/albums", h.handleListLikedAlbums)
 			authed.Get("/likes/artists", h.handleListLikedArtists)
 			authed.Get("/likes/ids", h.handleGetLikedIDs)
+
+			authed.Get("/lidarr/search", h.handleLidarrSearch)
 		})
 	})
 }
 
 type handlers struct {
-	pool   *pgxpool.Pool
-	logger *slog.Logger
-	events *playevents.Writer
-	recCfg config.RecommendationConfig
-	rng    func() float64
+	pool      *pgxpool.Pool
+	logger    *slog.Logger
+	events    *playevents.Writer
+	recCfg    config.RecommendationConfig
+	rng       func() float64
+	lidarrCfg *lidarrconfig.Service
 }