rename player.json to player.ui to match bricks convention

Sources/PlayerBridge.swift

@@ -78,8 +78,8 @@ final class PlayerBridge: ObservableObject {
         
         engine = eng
         
-        // 加载player.json
-        loadPlayerJSON(engine: eng)
+        // 加载player.ui
+        loadPlayerUI(engine: eng)
         
         // 注册事件监听
         registerEvents(engine: eng)
@@ -91,13 +91,13 @@ final class PlayerBridge: ObservableObject {
         setupTimeObserver()
     }
     
-    // MARK: - 加载JSON
+    // MARK: - 加载UI定义文件
     
-    private func loadPlayerJSON(engine: BricksEngine) {
-        // 从Bundle加载player.json
+    private func loadPlayerUI(engine: BricksEngine) {
+        // 从Bundle加载player.ui
         let bundle = Bundle.module
         
-        if let url = bundle.url(forResource: "player", withExtension: "json"),
+        if let url = bundle.url(forResource: "player", withExtension: "ui"),
            let data = try? Data(contentsOf: url),
            let json = String(data: data, encoding: .utf8) {
             do {