chore: 调整开源许可证为 Apache 2.0

新增根目录 Apache 2.0 许可证文件，并同步更新仓库文档与前端包元数据声明。

LICENSE

@@ -0,0 +1,184 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+Copyright [yyyy] [name of copyright owner]
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+Licensed under the Apache License, Version 2.0 (the "License");
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+    http://www.apache.org/licenses/LICENSE-2.0
+
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README.md

@@ -334,4 +334,4 @@ make frontend-clean             # 清理前端构建产物
 
 ## 许可证
 
-MIT
+Apache License 2.0

frontend/package.json

@@ -2,6 +2,7 @@
   "name": "frontend",
   "private": true,
   "version": "0.0.0",
+  "license": "Apache-2.0",
   "type": "module",
   "scripts": {
     "dev": "vite",

scripts/detect/README.md

@@ -347,4 +347,4 @@ if __name__ == "__main__":
 
 ## 许可证
 
-MIT
+Apache License 2.0