fix: 适配X-Claude-Code-Session-Id头

backend/internal/service/header_util.go

@@ -36,6 +36,11 @@ var headerWireCasing = map[string]string{
 	"sec-fetch-mode":                            "sec-fetch-mode",
 	"accept-encoding":                           "accept-encoding",
 	"authorization":                             "authorization",
+
+	// Claude Code 2.1.87+ 新增 header
+	"x-claude-code-session-id": "X-Claude-Code-Session-Id",
+	"x-client-request-id":      "x-client-request-id",
+	"content-length":           "content-length",
 }
 
 // headerWireOrder 定义真实 Claude CLI 发送 header 的顺序（基于抓包）。
@@ -55,11 +60,14 @@ var headerWireOrder = []string{
 	"authorization",
 	"x-app",
 	"User-Agent",
+	"X-Claude-Code-Session-Id",
 	"content-type",
 	"anthropic-beta",
+	"x-client-request-id",
 	"accept-language",
 	"sec-fetch-mode",
 	"accept-encoding",
+	"content-length",
 	"x-stainless-helper-method",
 }