Initial commit: apt-wrapper - Simple APT transaction wrapper

- Core transaction API with add_package, resolve, commit, rollback
- Version tracking for upgrades/downgrades
- Simple package info with FFI conversion functions
- Comprehensive error handling
- Basic test suite
- Clean, minimal implementation (~326 lines total)

tests/unit/test_basic.rs

@@ -0,0 +1,50 @@
+//! Unit tests for basic functionality
+
+use apt_wrapper::{AptTransaction, AptPackage, AptRepository, PackageDatabase};
+
+#[test]
+fn test_transaction_creation() {
+    let transaction = AptTransaction::new().unwrap();
+    assert!(transaction.is_empty());
+    assert_eq!(transaction.packages().len(), 0);
+}
+
+#[test]
+fn test_transaction_add_package() {
+    let mut transaction = AptTransaction::new().unwrap();
+    transaction.add_package("vim").unwrap();
+    assert!(!transaction.is_empty());
+    assert_eq!(transaction.packages().len(), 1);
+    assert_eq!(transaction.packages()[0], "vim");
+}
+
+#[test]
+fn test_transaction_resolve() {
+    let mut transaction = AptTransaction::new().unwrap();
+    transaction.add_package("vim").unwrap();
+    transaction.resolve().unwrap();
+    // Should not panic
+}
+
+#[test]
+fn test_package_creation() {
+    let package = AptPackage::new("vim".to_string(), "2:8.2.2434-3+deb11u1".to_string());
+    assert_eq!(package.name(), "vim");
+    assert_eq!(package.version(), "2:8.2.2434-3+deb11u1");
+}
+
+#[test]
+fn test_repository_creation() {
+    let repo = AptRepository::new(
+        "debian".to_string(),
+        "http://deb.debian.org/debian".to_string(),
+    );
+    assert_eq!(repo.name(), "debian");
+    assert_eq!(repo.url(), "http://deb.debian.org/debian");
+}
+
+#[test]
+fn test_package_database_creation() {
+    let db = PackageDatabase::new().unwrap();
+    assert!(!db.is_stale());
+}