fix(packaging): use version from spec file for RPM builds

- Update Makefile to extract PKG_VERSION from spec file
  Reads '%define spec_version 1.0.2' as default version
- Update spec file with proper version macro logic
  Version field now uses %{spec_version}
  Supports override via --define 'build_version X.Y.Z'
  Falls back to 1.0.2 when build_version is not defined

This ensures RPM packages are built with the correct version
defined in the spec file (1.0.2) instead of hardcoded 1.0.0.

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

packaging/rpm/ja4sentinel.spec

@@ -1,11 +1,18 @@
 Name:           ja4sentinel
-Version:        %{?build_version}%{!?build_version:1.0.0}
+Version:        %{spec_version}
 Release:        1%{?dist}
 Summary:        JA4 TLS fingerprinting daemon for network monitoring
 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 1.0.2
+%endif
+
 # Distribution-agnostic dependencies
 # systemd is available on all target distros (Rocky 8/9/10, AlmaLinux)
 Requires:       systemd