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>

Makefile

@@ -20,11 +20,8 @@ BUILD_DIR=build
 # RPM build directory
 RPM_DIR=$(DIST_DIR)/rpm
 
-# Package version (strip 'v' prefix from git tags)
-# Set to explicit version for release builds, or use git-based version for dev builds
-PKG_VERSION ?= 1.0.0
-# Alternative git-based version (uncomment for dev builds):
-# PKG_VERSION=$(shell git describe --tags --always --dirty 2>/dev/null | sed 's/^v//')
+# Package version (extract default from spec file, can be overridden)
+PKG_VERSION ?= $(shell grep '^%define spec_version' packaging/rpm/ja4sentinel.spec | tail -1 | awk '{print $$3}')
 
 # Build flags
 VERSION=$(PKG_VERSION)