fix(proxy): remove hardcoded ?beta=true injection, passthrough client query params

- handlers.rs: add `uri` extractor to capture client's full path+query
- claude.rs: remove ?beta=true injection from build_url(), update tests
- stream_check.rs: remove ?beta=true from health check URL

The proxy no longer injects ?beta=true into API URLs. Instead, query
parameters sent by the Claude Code client are transparently passed through.
This fixes duplicate ?beta=true issues and aligns with upstream behavior
where the client already sends this parameter.

src-tauri/src/proxy/handlers.rs

@@ -56,12 +56,19 @@ pub async fn get_status(State(state): State<ProxyState>) -> Result<Json<ProxySta
 /// - 现在 OpenRouter 已推出 Claude Code 兼容接口，默认不再启用该转换（逻辑保留以备回退）
 pub async fn handle_messages(
     State(state): State<ProxyState>,
+    uri: axum::http::Uri,
     headers: axum::http::HeaderMap,
     Json(body): Json<Value>,
 ) -> Result<axum::response::Response, ProxyError> {
     let mut ctx =
         RequestContext::new(&state, &body, &headers, AppType::Claude, "Claude", "claude").await?;
 
+    // 提取完整路径+query（如 "/v1/messages?beta=true"），透传客户端 URI
+    let endpoint = uri
+        .path_and_query()
+        .map(|pq| pq.as_str())
+        .unwrap_or(uri.path());
+
     let is_stream = body
         .get("stream")
         .and_then(|s| s.as_bool())
@@ -72,7 +79,7 @@ pub async fn handle_messages(
     let result = match forwarder
         .forward_with_retry(
             &AppType::Claude,
-            "/v1/messages",
+            endpoint,
             body.clone(),
             headers,
             ctx.get_providers(),

src-tauri/src/proxy/providers/claude.rs

@@ -251,6 +251,8 @@ impl ProviderAdapter for ClaudeAdapter {
         //
         // 现在 OpenRouter 已推出 Claude Code 兼容接口，因此默认直接透传 endpoint。
         // 如需回退旧逻辑，可在 forwarder 中根据 needs_transform 改写 endpoint。
+        //
+        // ?beta=true 不再由代理注入，而是由客户端自身发送并透传。
 
         let mut base = format!(
             "{}/{}",
@@ -263,19 +265,7 @@ impl ProviderAdapter for ClaudeAdapter {
             base = base.replace("/v1/v1", "/v1");
         }
 
-        // 为 Claude 原生 /v1/messages 端点添加 ?beta=true 参数
-        // 这是某些上游服务（如 DuckCoding）验证请求来源的关键参数
-        // 注意：不要为 OpenAI Chat Completions (/v1/chat/completions) 添加此参数
-        //       当 apiFormat="openai_chat" 时，请求会转发到 /v1/chat/completions，
-        //       但该端点是 OpenAI 标准，不支持 ?beta=true 参数
-        if endpoint.contains("/v1/messages")
-            && !endpoint.contains("/v1/chat/completions")
-            && !endpoint.contains('?')
-        {
-            format!("{base}?beta=true")
-        } else {
-            base
-        }
+        base
     }
 
     fn add_auth_headers(&self, request: RequestBuilder, auth: &AuthInfo) -> RequestBuilder {
@@ -487,23 +477,21 @@ mod tests {
     #[test]
     fn test_build_url_anthropic() {
         let adapter = ClaudeAdapter::new();
-        // /v1/messages 端点会自动添加 ?beta=true 参数
+        // ?beta=true 不再由代理注入，而是由客户端自身发送并透传
         let url = adapter.build_url("https://api.anthropic.com", "/v1/messages");
-        assert_eq!(url, "https://api.anthropic.com/v1/messages?beta=true");
+        assert_eq!(url, "https://api.anthropic.com/v1/messages");
     }
 
     #[test]
     fn test_build_url_openrouter() {
         let adapter = ClaudeAdapter::new();
-        // /v1/messages 端点会自动添加 ?beta=true 参数
         let url = adapter.build_url("https://openrouter.ai/api", "/v1/messages");
-        assert_eq!(url, "https://openrouter.ai/api/v1/messages?beta=true");
+        assert_eq!(url, "https://openrouter.ai/api/v1/messages");
     }
 
     #[test]
     fn test_build_url_no_beta_for_other_endpoints() {
         let adapter = ClaudeAdapter::new();
-        // 非 /v1/messages 端点不添加 ?beta=true
         let url = adapter.build_url("https://api.anthropic.com", "/v1/complete");
         assert_eq!(url, "https://api.anthropic.com/v1/complete");
     }
@@ -511,16 +499,14 @@ mod tests {
     #[test]
     fn test_build_url_preserve_existing_query() {
         let adapter = ClaudeAdapter::new();
-        // 已有查询参数时不重复添加
-        let url = adapter.build_url("https://api.anthropic.com", "/v1/messages?foo=bar");
-        assert_eq!(url, "https://api.anthropic.com/v1/messages?foo=bar");
+        // 客户端携带的 query 参数原样透传
+        let url = adapter.build_url("https://api.anthropic.com", "/v1/messages?beta=true");
+        assert_eq!(url, "https://api.anthropic.com/v1/messages?beta=true");
     }
 
     #[test]
     fn test_build_url_no_beta_for_openai_chat_completions() {
         let adapter = ClaudeAdapter::new();
-        // OpenAI Chat Completions 端点不添加 ?beta=true
-        // 这是 Nvidia 等 apiFormat="openai_chat" 供应商使用的端点
         let url = adapter.build_url("https://integrate.api.nvidia.com", "/v1/chat/completions");
         assert_eq!(url, "https://integrate.api.nvidia.com/v1/chat/completions");
     }

src-tauri/src/services/stream_check.rs

@@ -293,11 +293,11 @@ impl StreamCheckService {
         timeout: std::time::Duration,
     ) -> Result<(u16, String), AppError> {
         let base = base_url.trim_end_matches('/');
-        // URL 必须包含 ?beta=true 参数（某些中转服务依赖此参数验证请求来源）
+        // 健康检查不注入 ?beta=true，依赖 anthropic-beta header 传递身份验证信息
         let url = if base.ends_with("/v1") {
-            format!("{base}/messages?beta=true")
+            format!("{base}/messages")
         } else {
-            format!("{base}/v1/messages?beta=true")
+            format!("{base}/v1/messages")
         };
 
         let body = json!({