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/server/server.go

@@ -17,6 +17,7 @@ import (
 	"git.fabledsword.com/bvandeusen/minstrel/internal/auth"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/config"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/library"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/lidarrconfig"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/playevents"
 	"git.fabledsword.com/bvandeusen/minstrel/internal/subsonic"
 	"git.fabledsword.com/bvandeusen/minstrel/web"
@@ -55,7 +56,7 @@ func (s *Server) Router() http.Handler {
 			s.EventsCfg.SkipMaxCompletionRatio,
 			s.EventsCfg.SkipMaxDurationPlayedMs,
 		)
-		api.Mount(r, s.Pool, s.Logger, writer, s.RecommendationCfg)
+		api.Mount(r, s.Pool, s.Logger, writer, s.RecommendationCfg, lidarrconfig.New(s.Pool))
 		r.Route("/api/admin", func(admin chi.Router) {
 			admin.Use(auth.RequireUser(s.Pool))
 			admin.Use(auth.RequireAdmin())