docs: add version update workflow documentation to development guides

Add comprehensive documentation for the version update process in both English and Chinese development guides:
- Document manifest.json and package.json version synchronization during releases
- Explain update_versions.py script usage with examples (default, --version, --dry-run)
- List all files updated by the script (package.json, manifest.json, pyproject.toml, READMEs)
- Provide guidance on manual tool updates outside release

docs/development/README-DEV-zh.md

@@ -338,6 +338,36 @@ python3 tools/stress_mcp.py \
 4. **迭代** - 按需重复 1-3
 5. **Restore** 完成后用 `restore-dev.bat` 恢复原始文件
 
+## 重要说明
+
+### 更新工具和 Manifest
+
+在 Unity 包中添加或修改 MCP 工具时：
+- 工具定义位于仓库根目录的 manifest.json 文件中
+- 在发布过程中，manifest.json 版本会自动与 MCPForUnity/package.json 保持同步
+- 如果在发布过程之外手动更新工具，请确保相应更新 manifest.json 版本
+- 使用综合版本更新脚本：`python3 tools/update_versions.py` 来同步项目中所有版本引用
+
+`update_versions.py` 脚本会更新：
+- MCPForUnity/package.json（Unity 包版本）
+- manifest.json（MCP bundle manifest）
+- Server/pyproject.toml（Python 包版本）
+- Server/README.md（版本引用）
+- README.md（固定版本示例）
+- docs/i18n/README-zh.md（固定版本示例）
+
+使用示例：
+```bash
+# 更新所有文件以匹配 package.json 版本
+python3 tools/update_versions.py
+
+# 更新所有文件到指定版本
+python3 tools/update_versions.py --version 9.2.0
+
+# 干运行以查看将要更新的内容
+python3 tools/update_versions.py --dry-run
+```
+
 ## Troubleshooting
 
 ### 运行 .bat 时出现 "Path not found"

docs/development/README-DEV.md

@@ -328,6 +328,36 @@ We provide a CI job to run a Natural Language Editing suite against the Unity te
 4. **Iterate** - repeat steps 1-3 as needed
 5. **Restore** original files when done using `restore-dev.bat`
 
+## Important Notes
+
+### Updating Tools and Manifest
+
+When adding or modifying MCP tools in the Unity package:
+- Tool definitions are located in the manifest.json file at the repository root
+- The manifest.json version is automatically kept in sync with MCPForUnity/package.json during releases
+- If you manually update tools outside of the release process, ensure to update the manifest.json version accordingly
+- Use the comprehensive version update script: `python3 tools/update_versions.py` to sync all version references across the project
+
+The `update_versions.py` script updates:
+- MCPForUnity/package.json (Unity package version)
+- manifest.json (MCP bundle manifest)
+- Server/pyproject.toml (Python package version)
+- Server/README.md (version references)
+- README.md (fixed version examples)
+- docs/i18n/README-zh.md (fixed version examples)
+
+Usage examples:
+```bash
+# Update all files to match package.json version
+python3 tools/update_versions.py
+
+# Update all files to a specific version
+python3 tools/update_versions.py --version 9.2.0
+
+# Dry run to see what would be updated
+python3 tools/update_versions.py --dry-run
+```
+
 ## Troubleshooting
 
 ### "Path not found" errors running the .bat file