Major apt-ostree refactor: Simplified architecture, Debian Trixie compatibility

- ✅ Successfully compiled with apt-pkg-native for Debian Trixie compatibility
- ✅ Replaced rust-apt with apt-pkg-native to resolve C++ standard issues
- ✅ Simplified project structure: removed unused binaries, focused on core functionality
- ✅ Basic commands working: help, list, search, info
- ✅ Created apt_compat.rs compatibility layer
- ✅ Updated debian packaging for libapt-pkg7.0 compatibility
- ✅ Removed complex dependencies and simplified main.rs
- 🎯 Next: Implement core package management commands (install, remove, upgrade)
- 🎯 Architecture: Ready for atomic package management with OSTree integration

Cargo.toml

@@ -9,8 +9,8 @@ keywords = ["apt", "ostree", "debian", "ubuntu", "package-management"]
 categories = ["system", "command-line-utilities"]
 
 [dependencies]
-# APT integration
-rust-apt = "0.8.0"
+# APT integration - using apt-pkg-native for better Debian Trixie compatibility
+apt-pkg-native = "0.3.3"
 
 # OSTree integration
 ostree = "0.20.3"