fix(copilot): unify request fingerprint across all Copilot API calls

- Make header constants in copilot_auth.rs public, add COPILOT_INTEGRATION_ID
- Unify User-Agent across 4 internal methods (eliminate "CC-Switch" leakage) and version string
- claude.rs add_auth_headers now references shared constants, adds user-agent / api-version / openai-intent
- forwarder.rs filters all 6 fixed fingerprint headers for Copilot requests to prevent reqwest append duplication
- stream_check.rs health check pipeline aligned with new fingerprint

src-tauri/src/services/stream_check.rs

@@ -13,6 +13,7 @@ use crate::app_config::AppType;
 use crate::error::AppError;
 use crate::provider::Provider;
 use crate::proxy::providers::transform::anthropic_to_openai;
+use crate::proxy::providers::copilot_auth;
 use crate::proxy::providers::{get_adapter, AuthInfo, AuthStrategy};
 
 /// 健康状态枚举
@@ -362,9 +363,12 @@ impl StreamCheckService {
                 .header("content-type", "application/json")
                 .header("accept", "text/event-stream")
                 .header("accept-encoding", "identity")
-                .header("editor-version", "vscode/1.85.0")
-                .header("editor-plugin-version", "copilot/1.150.0")
-                .header("copilot-integration-id", "vscode-chat");
+                .header("user-agent", copilot_auth::COPILOT_USER_AGENT)
+                .header("editor-version", copilot_auth::COPILOT_EDITOR_VERSION)
+                .header("editor-plugin-version", copilot_auth::COPILOT_PLUGIN_VERSION)
+                .header("copilot-integration-id", copilot_auth::COPILOT_INTEGRATION_ID)
+                .header("x-github-api-version", copilot_auth::COPILOT_API_VERSION)
+                .header("openai-intent", "conversation-panel");
         } else if is_openai_chat {
             // OpenAI-compatible: Bearer auth + standard headers only
             request_builder = request_builder