feat: safely merge partial persistent updates and update hide ui script

internal/gameserver/smoke_test.go

@@ -138,8 +138,12 @@ func TestGatewayHandshakeAndLogin(t *testing.T) {
 	if cmdID != 4112 {
 		t.Fatalf("unexpected GetUnreleasedBlockInfoScRsp id: got %d want 4112", cmdID)
 	}
-	if len(body) != 2 || body[0] != 0x70 || body[1] != 0x00 {
-		t.Fatalf("unexpected UnreleasedBlockInfo body: %x", body)
+	blockRsp := &goproto.GetUnreleasedBlockInfoScRsp{}
+	if err := proto.Unmarshal(body, blockRsp); err != nil {
+		t.Fatalf("unmarshal GetUnreleasedBlockInfo: %v", err)
+	}
+	if blockRsp.Retcode != 0 {
+		t.Fatalf("unexpected UnreleasedBlockInfo retcode: %d", blockRsp.Retcode)
 	}
 	t.Log("GetUnreleasedBlockInfo verified: 4190 -> 4112 retcode 0")
 

internal/sdkserver/api.go

@@ -312,7 +312,16 @@ func apiPersistentData(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 
-		out, _ := json.MarshalIndent(parsed, "", "  ")
+		// Merge into existing persistent file so partial updates (e.g. lineups or switches) preserve other settings
+		existing := make(map[string]any)
+		if raw, err := os.ReadFile("persistent"); err == nil {
+			_ = json.Unmarshal(raw, &existing)
+		}
+		for k, v := range parsed {
+			existing[k] = v
+		}
+
+		out, _ := json.MarshalIndent(existing, "", "  ")
 		if err := os.WriteFile("persistent", out, 0o644); err != nil {
 			writeJSON(w, map[string]any{"error": "failed to write persistent: " + err.Error(), "status": 500})
 			return