Update README: LocalPrefs.Shared is Unity-only

[Copilot]

• Explore codebase to understand the changes to LocalPrefs.Shared
• Update README.md (English):
  • Fix point 1 wording to match reviewer's intent
  • Remove Note callout from Quick Start section
  • Fix namespace to using AndanteTribe.IO.Unity;
• Update README_JA.md (Japanese):
  • Fix point 1 with exact text requested by reviewer
  • Remove Note callout from クイックスタート section
  • Fix namespace to using AndanteTribe.IO.Unity;

Original prompt

---

This section details on the original issue you should resolve

<issue_title>LocalPrefs.Sharedの変更をREADMEに反映する</issue_title>
<issue_description>LocalPrefs.Shared を.NETでは使用できない変更を加えた（Unityでしか使用できない）ので、必要なREADMEの修正をする</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes LocalPrefs.Sharedの変更をREADMEに反映する #47

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[kochounoyume]

@copilot

[kochounoyume]

不要（英語版も同じく）

[Copilot]

Done in 21998c7 — removed the Note callouts from both README.md and README_JA.md.

[kochounoyume]

ライブラリの売りをいうところで、変な説明になっている．

LocalPrefs.Shared （LocalPrefs.Unity）の保存先は基本的に Application.persistentDataPath 、WebGLだと自動的に最適な保存先が指定されます。

これでおねがい

[Copilot]

Updated in 21998c7:

• README_JA.md: `LocalPrefs.Shared` （`LocalPrefs.Unity`）の保存先は基本的に `Application.persistentDataPath` 、WebGLだと自動的に最適な保存先が指定されます。
• README.md: The save path of LocalPrefs.Shared (LocalPrefs.Unity) defaults to Application.persistentDataPath. On WebGL, the optimal save destination is automatically configured.