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/apt-ostree.bash-completion

@@ -0,0 +1,72 @@
+# apt-ostree bash completion
+# Generated for apt-ostree version 0.1.0
+
+_apt_ostree()
+{
+    local cur prev opts cmds
+    COMPREPLY=()
+    cur="${COMP_WORDS[COMP_CWORD]}"
+    prev="${COMP_WORDS[COMP_CWORD-1]}"
+
+    # Main commands
+    cmds="info search install remove upgrade rollback status help version"
+
+    # Global options
+    opts="--help --version --verbose --quiet --config --data-dir --log-level"
+
+    # If this is the first word, complete with commands
+    if [[ ${COMP_CWORD} -eq 1 ]]; then
+        COMPREPLY=( $(compgen -W "${cmds}" -- "${cur}") )
+        return 0
+    fi
+
+    # Handle command-specific completions
+    case "${prev}" in
+        info)
+            # Complete with package names from APT cache
+            if command -v apt-cache >/dev/null 2>&1; then
+                local packages=$(apt-cache --no-generate pkgnames 2>/dev/null | grep -i "^${cur}" | head -20)
+                COMPREPLY=( $(compgen -W "${packages}" -- "${cur}") )
+            fi
+            ;;
+        search)
+            # Complete with common search terms
+            local search_terms="package name description maintainer"
+            COMPREPLY=( $(compgen -W "${search_terms}" -- "${cur}") )
+            ;;
+        install|remove)
+            # Complete with package names from APT cache
+            if command -v apt-cache >/dev/null 2>&1; then
+                local packages=$(apt-cache --no-generate pkgnames 2>/dev/null | grep -i "^${cur}" | head -20)
+                COMPREPLY=( $(compgen -W "${packages}" -- "${cur}") )
+            fi
+            ;;
+        --config)
+            # Complete with configuration files
+            COMPREPLY=( $(compgen -f -X "!*.toml" -- "${cur}") )
+            ;;
+        --data-dir)
+            # Complete with directories
+            COMPREPLY=( $(compgen -d -- "${cur}") )
+            ;;
+        --log-level)
+            # Complete with log levels
+            local log_levels="trace debug info warn error"
+            COMPREPLY=( $(compgen -W "${log_levels}" -- "${cur}") )
+            ;;
+        *)
+            # Complete with global options if not a command
+            if [[ ${cur} == -* ]]; then
+                COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
+            fi
+            ;;
+    esac
+
+    return 0
+}
+
+# Register the completion function
+complete -F _apt_ostree apt-ostree
+
+# Also complete for the short alias if it exists
+complete -F _apt_ostree aost 2>/dev/null || true