feat(subsonic): wire /rest/scrobble into playevents.Writer

submission=false → play_started (replaces in-memory nowPlayingMap).
submission=true (default) → synthetic completed play. The nowPlayingMap
struct + factory + the nowPlaying field on mediaHandlers are deleted;
play_events WHERE ended_at IS NULL is now the source of truth for
'currently playing,' reachable from M3+ work.

api.Mount now takes the shared *playevents.Writer instead of cfg so
the same writer instance feeds both surfaces.

internal/api/api.go

@@ -6,26 +6,19 @@ package api
 
 import (
 	"log/slog"
-	"time"
 
 	"github.com/go-chi/chi/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
 
 	"git.fabledsword.com/bvandeusen/minstrel/internal/auth"
-	"git.fabledsword.com/bvandeusen/minstrel/internal/config"
 	"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.
-func Mount(r chi.Router, pool *pgxpool.Pool, logger *slog.Logger, cfg config.EventsConfig) {
-	w := playevents.NewWriter(
-		pool, logger,
-		time.Duration(cfg.SessionTimeoutMinutes)*time.Minute,
-		cfg.SkipMaxCompletionRatio,
-		cfg.SkipMaxDurationPlayedMs,
-	)
-	h := &handlers{pool: pool, logger: logger, events: w}
+// 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) {
+	h := &handlers{pool: pool, logger: logger, events: events}
 
 	r.Route("/api", func(api chi.Router) {
 		api.Post("/auth/login", h.handleLogin)

internal/api/library_test.go

@@ -2,13 +2,16 @@ package api
 
 import (
 	"encoding/json"
+	"io"
+	"log/slog"
 	"net/http"
 	"net/http/httptest"
 	"testing"
+	"time"
 
 	"github.com/go-chi/chi/v5"
 
-	"git.fabledsword.com/bvandeusen/minstrel/internal/config"
+	"git.fabledsword.com/bvandeusen/minstrel/internal/playevents"
 )
 
 // newLibraryRouter builds a test-only chi router with the library handlers
@@ -435,11 +438,9 @@ func TestHandleListArtists_EmptyDB(t *testing.T) {
 func TestRoutesRegisteredInMount(t *testing.T) {
 	h, _ := testHandlers(t)
 	r := chi.NewRouter()
-	Mount(r, h.pool, h.logger, config.EventsConfig{
-		SessionTimeoutMinutes:   30,
-		SkipMaxCompletionRatio:  0.5,
-		SkipMaxDurationPlayedMs: 30000,
-	})
+	w := playevents.NewWriter(h.pool, slog.New(slog.NewTextHandler(io.Discard, nil)),
+		30*time.Minute, 0.5, 30000)
+	Mount(r, h.pool, h.logger, w)
 
 	paths := []string{
 		"/api/artists",