fix(rpm): move version macro definition before Version field

The %{spec_version} macro was being referenced in the Version field
before it was defined, causing RPM packages to show literal '%{spec_version}'
instead of the actual version number.

Moving the macro definition to the top of the spec file ensures it's
expanded correctly during rpmbuild.

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

packaging/rpm/ja4sentinel.spec

@@ -1,3 +1,11 @@
+# Version macro must be defined BEFORE it's used in Version: field
+# Override from command line: rpmbuild --define "build_version X.Y.Z"
+%if %{defined build_version}
+%define spec_version %{build_version}
+%else
+%define spec_version 1.0.4
+%endif
+
 Name:           ja4sentinel
 Version:        %{spec_version}
 Release:        1%{?dist}
@@ -6,13 +14,6 @@ License:        MIT
 URL:            https://github.com/your-repo/ja4sentinel
 BuildArch:      x86_64
 
-# Override version from command line: rpmbuild --define "build_version X.Y.Z"
-%if %{defined build_version}
-%define spec_version %{build_version}
-%else
-%define spec_version 1.0.4
-%endif
-
 # Distribution-agnostic dependencies
 # systemd is available on all target distros (Rocky 8/9/10, AlmaLinux)
 Requires:       systemd