清理冗余代码：删除未使用变量、types.ts 改为 .d.ts、测试路径改引 dist/

- 删除未使用的 getActiveEnv 解构、sender 参数改为 _sender
- types.ts 重命名为 types.d.ts，消除无用的 dist/types.js 产物
- 测试文件引用路径从根目录改为 dist/

tests/crypto-store.test.js

@@ -27,8 +27,8 @@ function createMemoryStorage() {
 
 function loadCryptoStore(storage) {
   global.chrome = { storage };
-  delete require.cache[require.resolve("../crypto-store.js")];
-  return require("../crypto-store.js");
+  delete require.cache[require.resolve("../dist/crypto-store.js")];
+  return require("../dist/crypto-store.js");
 }
 
 describe("crypto-store - 基础加解密", () => {