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/types.go

@@ -1,6 +1,10 @@
 package api
 
-import "github.com/jackc/pgx/v5/pgtype"
+import (
+	"time"
+
+	"github.com/jackc/pgx/v5/pgtype"
+)
 
 // LoginRequest is the POST /api/auth/login body. Kept boring on purpose —
 // web and Flutter both send the same payload.
@@ -112,3 +116,17 @@ type HomePayload struct {
 	MostPlayedTracks    []TrackRef  `json:"most_played_tracks"`
 	LastPlayedArtists   []ArtistRef `json:"last_played_artists"`
 }
+
+// HistoryEvent is one play in a user's listening history. Used by
+// /api/me/history; one event per row from play_events.
+type HistoryEvent struct {
+	ID       string    `json:"id"`        // play_events.id
+	PlayedAt time.Time `json:"played_at"` // play_events.started_at
+	Track    TrackRef  `json:"track"`
+}
+
+// HistoryResponse is the body of GET /api/me/history.
+type HistoryResponse struct {
+	Events  []HistoryEvent `json:"events"`
+	HasMore bool           `json:"has_more"`
+}