Convert public directory from submodule to normal directory

- Remove public from git submodule tracking
- Add all public directory contents as regular files
- Fixes GitHub Actions error: "No url found for submodule path 'public' in .gitmodules"

🤖 Generated with [Claude Code](https://claude.ai/code)

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

public/holo/static/js/main.ecb2de8a.js.LICENSE.txt

@@ -0,0 +1,83 @@
+/*!
+ * @pixiv/three-vrm v3.1.1
+ * VRM file loader for three.js.
+ *
+ * Copyright (c) 2019-2024 pixiv Inc.
+ * @pixiv/three-vrm is distributed under MIT License
+ * https://github.com/pixiv/three-vrm/blob/release/LICENSE
+ */
+
+/*!
+ * @pixiv/three-vrm-animation v3.1.1
+ * The implementation of VRM Animation
+ *
+ * Copyright (c) 2019-2024 pixiv Inc.
+ * @pixiv/three-vrm-animation is distributed under MIT License
+ * https://github.com/pixiv/three-vrm/blob/release/LICENSE
+ */
+
+/**
+ * @license
+ * Copyright 2010-2024 Three.js Authors
+ * SPDX-License-Identifier: MIT
+ */
+
+/**
+ * @license React
+ * react-dom.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/**
+ * @license React
+ * react-jsx-runtime.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/**
+ * @license React
+ * react-reconciler-constants.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/**
+ * @license React
+ * react-reconciler.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/**
+ * @license React
+ * react.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+/**
+ * @license React
+ * scheduler.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */