feat: add provider user agent override

src-tauri/src/provider.rs

@@ -460,6 +460,9 @@ pub struct ProviderMeta {
     /// Codex Responses -> Chat Completions reasoning capability metadata.
     #[serde(rename = "codexChatReasoning", skip_serializing_if = "Option::is_none")]
     pub codex_chat_reasoning: Option<CodexChatReasoningConfig>,
+    /// Custom User-Agent for local proxy routing.
+    #[serde(rename = "customUserAgent", skip_serializing_if = "Option::is_none")]
+    pub custom_user_agent: Option<String>,
     /// 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")]

src-tauri/src/proxy/forwarder.rs

@@ -1537,6 +1537,15 @@ impl RequestForwarder {
                 Vec::new()
             };
 
+        let custom_user_agent = provider
+            .meta
+            .as_ref()
+            .and_then(|meta| meta.custom_user_agent.as_deref())
+            .map(str::trim)
+            .filter(|ua| !ua.is_empty())
+            .filter(|_| !is_copilot)
+            .and_then(|ua| http::HeaderValue::from_str(ua).ok());
+
         // --- Copilot 优化器：动态 header 注入 ---
         if let Some((ref classification, ref det_request_id, ref interaction_id)) =
             copilot_optimization
@@ -1631,6 +1640,7 @@ impl RequestForwarder {
         let mut ordered_headers = http::HeaderMap::new();
         let mut saw_auth = false;
         let mut saw_accept_encoding = false;
+        let mut saw_user_agent = false;
         let mut saw_anthropic_beta = false;
         let mut saw_anthropic_version = false;
 
@@ -1711,6 +1721,19 @@ impl RequestForwarder {
                 continue;
             }
 
+            // --- user-agent: provider-level override for local proxy routing ---
+            if !is_copilot && key_str.eq_ignore_ascii_case("user-agent") {
+                if !saw_user_agent {
+                    saw_user_agent = true;
+                    if let Some(ref ua) = custom_user_agent {
+                        ordered_headers.append(http::header::USER_AGENT, ua.clone());
+                    } else {
+                        ordered_headers.append(key.clone(), value.clone());
+                    }
+                }
+                continue;
+            }
+
             // --- anthropic-beta — 用重建值替换（确保含 claude-code 标记） ---
             if key_str.eq_ignore_ascii_case("anthropic-beta") {
                 if !saw_anthropic_beta {
@@ -1760,6 +1783,12 @@ impl RequestForwarder {
             );
         }
 
+        if !saw_user_agent {
+            if let Some(ref ua) = custom_user_agent {
+                ordered_headers.append(http::header::USER_AGENT, ua.clone());
+            }
+        }
+
         // 如果原始请求中没有 anthropic-beta 且有值需要添加，追加
         if !saw_anthropic_beta {
             if let Some(ref beta_val) = anthropic_beta_value {