fix: 推送 meta 用 UseNumber 保留超过 2^53 的整数

internal/app/message/delivery_test.go

@@ -1,6 +1,7 @@
 package message
 
 import (
+	"bytes"
 	"context"
 	"database/sql"
 	"encoding/json"
@@ -742,3 +743,37 @@ func TestPushRevokedOnRecallAfterPush(t *testing.T) {
 		t.Fatal("expected revoked frame")
 	}
 }
+
+func TestPushPreservesLargeMetaInteger(t *testing.T) {
+	t.Parallel()
+	raw := `{"id":12345678901234567890}`
+	decoded := decodeMetaJSON(raw)
+	n, ok := decoded["id"].(json.Number)
+	if !ok || n.String() != "12345678901234567890" {
+		t.Fatalf("decode meta=%v", decoded)
+	}
+
+	e := openDeliveryEnv(t, nil)
+	insertEndpoint(t, e.db, "alice", "", 1, 0)
+	insertEndpoint(t, e.db, "bob", "", 1, 0)
+	e.online("bob", "c-bob")
+	ctx := context.Background()
+	req := baseSend("meta-big", "bob")
+	req.Meta = map[string]any{"id": json.Number("12345678901234567890")}
+	if _, err := e.app.Submit(ctx, "alice", port.ConnInfo{}, req); err != nil {
+		t.Fatal(err)
+	}
+	if err := e.app.PushPending(ctx, "bob", "c-bob"); err != nil {
+		t.Fatal(err)
+	}
+	found := false
+	for _, p := range e.down.Snapshots() {
+		if bytes.Contains(p.Payload, []byte("12345678901234567890")) {
+			found = true
+			break
+		}
+	}
+	if !found {
+		t.Fatalf("push payloads missing large int: %v", e.down.Snapshots())
+	}
+}