feat: 内部署名改为编译期注入（构建机本地文件，不进仓库）；关于页展示

server/internal/httpapi/handlers_system.go

@@ -0,0 +1,20 @@
+package httpapi
+
+import (
+	"net/http"
+
+	"git.yeij.top/AskaEth/Scoreboard/server/internal/auth"
+	"git.yeij.top/AskaEth/Scoreboard/server/internal/version"
+)
+
+// systemRoutes 挂载系统级只读信息。
+func (s *server) systemRoutes(mux *http.ServeMux) {
+	// 内部署名是编译期注入的，不暴露给匿名访客：至少要登录（recorder 及以上）才能读到
+	mux.HandleFunc("GET /api/system/about", s.read(auth.RoleRecorder, s.systemAbout))
+}
+
+func (s *server) systemAbout(w http.ResponseWriter, r *http.Request) (any, error) {
+	return map[string]any{
+		"internalSignature": version.InternalSignature,
+	}, nil
+}