feat(proxy): 添加本地代理请求覆盖功能，支持自定义请求头和请求体 (#4589)

* feat(proxy): 添加本地代理请求覆盖功能，支持自定义请求头和请求体

* fix(proxy): harden local request overrides validation

* feat(proxy): 添加受保护的本地代理请求头名称验证功能

* fix(i18n): 更新本地代理请求覆盖的错误提示信息格式

---------

Co-authored-by: jason.mei <jason.mei@ucloud.cn>

src-tauri/src/provider.rs

@@ -382,6 +382,21 @@ pub struct CodexChatReasoningConfig {
     pub output_format: Option<String>,
 }
 
+/// Local proxy request overrides applied after route/protocol transforms.
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct LocalProxyRequestOverrides {
+    #[serde(default, skip_serializing_if = "HashMap::is_empty")]
+    pub headers: HashMap<String, String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub body: Option<serde_json::Value>,
+}
+
+impl LocalProxyRequestOverrides {
+    pub fn is_empty(&self) -> bool {
+        self.headers.is_empty() && self.body.is_none()
+    }
+}
+
 /// 供应商元数据
 #[derive(Debug, Clone, Serialize, Deserialize, Default)]
 pub struct ProviderMeta {
@@ -466,6 +481,12 @@ pub struct ProviderMeta {
     /// Custom User-Agent for local proxy routing.
     #[serde(rename = "customUserAgent", skip_serializing_if = "Option::is_none")]
     pub custom_user_agent: Option<String>,
+    /// Local proxy request overrides applied to the transformed upstream request.
+    #[serde(
+        rename = "localProxyRequestOverrides",
+        skip_serializing_if = "Option::is_none"
+    )]
+    pub local_proxy_request_overrides: Option<LocalProxyRequestOverrides>,
     /// 累加模式应用中，该 provider 是否已写入 live config。
     /// `None` 表示旧数据/未知状态，`Some(false)` 表示明确仅存在于数据库中。
     #[serde(rename = "liveConfigManaged", skip_serializing_if = "Option::is_none")]
@@ -932,10 +953,11 @@ pub struct OpenCodeModelLimit {
 #[cfg(test)]
 mod tests {
     use super::{
-        ClaudeModelConfig, CodexModelConfig, GeminiModelConfig, OpenCodeProviderConfig, Provider,
-        ProviderManager, ProviderMeta, UniversalProvider,
+        ClaudeModelConfig, CodexModelConfig, GeminiModelConfig, LocalProxyRequestOverrides,
+        OpenCodeProviderConfig, Provider, ProviderManager, ProviderMeta, UniversalProvider,
     };
     use serde_json::json;
+    use std::collections::HashMap;
 
     #[test]
     fn provider_meta_serializes_pricing_model_source() {
@@ -963,6 +985,33 @@ mod tests {
         assert!(value.get("pricingModelSource").is_none());
     }
 
+    #[test]
+    fn provider_meta_roundtrips_local_proxy_request_overrides() {
+        let meta = ProviderMeta {
+            local_proxy_request_overrides: Some(LocalProxyRequestOverrides {
+                headers: HashMap::from([("X-Test".to_string(), "yes".to_string())]),
+                body: Some(json!({ "temperature": 0.2 })),
+            }),
+            ..ProviderMeta::default()
+        };
+
+        let value = serde_json::to_value(&meta).expect("serialize ProviderMeta");
+        assert_eq!(
+            value["localProxyRequestOverrides"]["headers"]["X-Test"],
+            "yes"
+        );
+        assert_eq!(
+            value["localProxyRequestOverrides"]["body"]["temperature"],
+            0.2
+        );
+
+        let decoded: ProviderMeta =
+            serde_json::from_value(value).expect("deserialize ProviderMeta");
+        let overrides = decoded.local_proxy_request_overrides.unwrap();
+        assert_eq!(overrides.headers.get("X-Test"), Some(&"yes".to_string()));
+        assert_eq!(overrides.body.unwrap()["temperature"], 0.2);
+    }
+
     #[test]
     fn provider_with_id_populates_defaults() {
         let settings_config = json!({