feat(http): reqwest 客户端启用 brotli / deflate 解码

对接部分 provider 时会返回 Content-Encoding: br / deflate，
缺少对应 feature 时 reqwest 只能按压缩字节原样交给调用方，
导致 text() 解码异常或 body 看似为空。显式开启两项 feature，
让所有标准压缩响应都可被正常还原。

src-tauri/src/commands/mod.rs

@@ -357,7 +357,11 @@ fn build_http_client_opt(
     user_agent: Option<&str>,
     use_proxy: bool,
 ) -> Result<reqwest::Client, String> {
-    let mut builder = reqwest::Client::builder().timeout(timeout).gzip(true);
+    let mut builder = reqwest::Client::builder()
+        .timeout(timeout)
+        .gzip(true)
+        .brotli(true)
+        .deflate(true);
     if let Some(ua) = user_agent {
         builder = builder.user_agent(ua);
     }