Move versions/filelocker into dedicated subpackages, and consistent headers in http requests (#888)

- move filelocker logic into dedicated subpackage
- consistent useragent in requests

Reviewed-on: https://gitea.com/gitea/tea/pulls/888
Co-authored-by: techknowlogick <techknowlogick@gitea.com>
Co-committed-by: techknowlogick <techknowlogick@gitea.com>

modules/httputil/httputil.go

@@ -0,0 +1,38 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package httputil
+
+import (
+	"fmt"
+	"net/http"
+	"runtime"
+
+	"code.gitea.io/tea/modules/version"
+)
+
+// UserAgent returns the standard User-Agent string for tea.
+func UserAgent() string {
+	ua := fmt.Sprintf("tea/%s (%s/%s)", version.Version, runtime.GOOS, runtime.GOARCH)
+	if version.SDK != "" {
+		ua += fmt.Sprintf(" go-sdk/%s", version.SDK)
+	}
+	return ua
+}
+
+// WrapTransport wraps an http.RoundTripper to add the User-Agent header.
+func WrapTransport(base http.RoundTripper) http.RoundTripper {
+	if base == nil {
+		base = http.DefaultTransport
+	}
+	return &userAgentTransport{base: base}
+}
+
+type userAgentTransport struct {
+	base http.RoundTripper
+}
+
+func (t *userAgentTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	req.Header.Set("User-Agent", UserAgent())
+	return t.base.RoundTrip(req)
+}