feat(server/m7-365): GET /api/me/history handler + integration test

Implements the listening-history endpoint for M7 #365: returns a user's
play events newest-first, excluding skipped events and quarantined tracks,
with offset/limit pagination and a has_more heuristic.

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

internal/api/api.go

@@ -45,6 +45,7 @@ func Mount(r chi.Router, pool *pgxpool.Pool, logger *slog.Logger, events *playev
 			authed.Get("/me", h.handleGetMe)
 			authed.Get("/me/listenbrainz", h.handleGetListenBrainz)
 			authed.Put("/me/listenbrainz", h.handlePutListenBrainz)
+			authed.Get("/me/history", h.handleGetMyHistory)
 
 			authed.Get("/artists", h.handleListArtists)
 			authed.Get("/artists/{id}", h.handleGetArtist)