feat: Implement comprehensive Debian packaging improvements and enhanced CI workflow

- Enhanced Package Information: Expanded PackageInfo struct with 23 fields including section, priority, maintainer, homepage, size, dependencies, and more
- Real Package Data Extraction: Integrated dpkg and apt-cache for actual package information instead of mock data
- Professional Debian Packaging: Added man pages, shell completions, postinst/prerm scripts, triggers, and lintian overrides
- Enhanced Build System: Improved debian/rules with cross-compilation support, enhanced build.sh with options and validation
- CI Workflow Updates: Added missing build dependencies, enhanced package validation, lintian quality checks, and comprehensive reporting
- Quality Assurance: Added lintian validation, enhanced file checking, and professional packaging standards
- Documentation: Comprehensive README.Debian with build instructions and troubleshooting guide

Resolves mock package issues and provides production-ready Debian packaging infrastructure.

debian/source/format

@@ -0,0 +1 @@
+3.0 (quilt)

debian/source/options

@@ -0,0 +1,29 @@
+# Source package options for apt-ostree
+# This file configures how the source package is built
+
+# Include all files in the source package
+tar-ignore = .git
+tar-ignore = .github
+tar-ignore = target
+tar-ignore = target-*
+tar-ignore = Cargo.lock
+tar-ignore = debian
+tar-ignore = .gitignore
+tar-ignore = .cargo
+tar-ignore = *.log
+tar-ignore = *.tmp
+tar-ignore = *.bak
+tar-ignore = *.orig
+tar-ignore = *.rej
+tar-ignore = *.patch
+tar-ignore = .DS_Store
+tar-ignore = Thumbs.db
+tar-ignore = .idea
+tar-ignore = .vscode
+tar-ignore = *.swp
+tar-ignore = *.swo
+tar-ignore = *~
+
+# Compress the source package with gzip
+compression = gzip
+compression-level = 9