feat(proxy): add ProviderType enum for fine-grained provider detection

Introduce ProviderType enum to distinguish between different provider
implementations (Claude, ClaudeAuth, Codex, Gemini, GeminiCli, OpenRouter).
This enables proper authentication handling and request transformation
based on the actual provider type rather than just AppType.

- Add ProviderType enum with detection logic from config
- Enhance Claude adapter with OpenRouter detection
- Enhance Gemini adapter with CLI mode detection
- Add helper methods for provider type inference

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

@@ -1,11 +1,21 @@
 //! Codex (OpenAI) Provider Adapter
 //!
 //! 仅透传模式，支持直连 OpenAI API
+//!
+//! ## 客户端检测
+//! 支持检测官方 Codex 客户端 (codex_vscode, codex_cli_rs)
 
 use super::{AuthInfo, AuthStrategy, ProviderAdapter};
 use crate::provider::Provider;
 use crate::proxy::error::ProxyError;
+use regex::Regex;
 use reqwest::RequestBuilder;
+use std::sync::LazyLock;
+
+/// 官方 Codex 客户端 User-Agent 正则
+#[allow(dead_code)]
+static CODEX_CLIENT_REGEX: LazyLock<Regex> =
+    LazyLock::new(|| Regex::new(r"^(codex_vscode|codex_cli_rs)/[\d.]+").unwrap());
 
 /// Codex 适配器
 pub struct CodexAdapter;
@@ -15,6 +25,14 @@ impl CodexAdapter {
         Self
     }
 
+    /// 检测是否为官方 Codex 客户端
+    ///
+    /// 匹配 User-Agent 模式: `^(codex_vscode|codex_cli_rs)/[\d.]+`
+    #[allow(dead_code)]
+    pub fn is_official_client(user_agent: &str) -> bool {
+        CODEX_CLIENT_REGEX.is_match(user_agent)
+    }
+
     /// 从 Provider 配置中提取 API Key
     fn extract_key(&self, provider: &Provider) -> Option<String> {
         // 1. 尝试从 env 中获取
@@ -212,4 +230,36 @@ mod tests {
         let url = adapter.build_url("https://www.packyapi.com/v1", "/v1/responses");
         assert_eq!(url, "https://www.packyapi.com/v1/responses");
     }
+
+    // 官方客户端检测测试
+    #[test]
+    fn test_is_official_client_vscode() {
+        assert!(CodexAdapter::is_official_client("codex_vscode/1.0.0"));
+        assert!(CodexAdapter::is_official_client("codex_vscode/2.3.4"));
+        assert!(CodexAdapter::is_official_client("codex_vscode/0.1"));
+    }
+
+    #[test]
+    fn test_is_official_client_cli() {
+        assert!(CodexAdapter::is_official_client("codex_cli_rs/1.0.0"));
+        assert!(CodexAdapter::is_official_client("codex_cli_rs/0.5.2"));
+    }
+
+    #[test]
+    fn test_is_not_official_client() {
+        assert!(!CodexAdapter::is_official_client("Mozilla/5.0"));
+        assert!(!CodexAdapter::is_official_client("curl/7.68.0"));
+        assert!(!CodexAdapter::is_official_client("python-requests/2.25.1"));
+        assert!(!CodexAdapter::is_official_client("codex_other/1.0.0"));
+        assert!(!CodexAdapter::is_official_client(""));
+    }
+
+    #[test]
+    fn test_is_official_client_partial_match() {
+        // 必须从开头匹配
+        assert!(!CodexAdapter::is_official_client("some codex_vscode/1.0.0"));
+        assert!(!CodexAdapter::is_official_client(
+            "prefix_codex_cli_rs/1.0.0"
+        ));
+    }
 }