Add custom types, version command, and restore --verify flag

- Add internal/types package with type-safe wrappers for IDs, hashes,
  paths, and credentials (FileID, BlobID, ChunkHash, etc.)
- Implement driver.Valuer and sql.Scanner for UUID-based types
- Add `vaultik version` command showing version, commit, go version
- Add `--verify` flag to restore command that checksums all restored
  files against expected chunk hashes with progress bar
- Remove fetch.go (dead code, functionality in restore)
- Clean up TODO.md, remove completed items
- Update all database and snapshot code to use new custom types

internal/vaultik/info.go

@@ -30,14 +30,23 @@ func (v *Vaultik) ShowInfo() error {
 
 	// Backup Settings
 	fmt.Printf("=== Backup Settings ===\n")
-	fmt.Printf("Source Directories:\n")
-	for _, dir := range v.Config.SourceDirs {
-		fmt.Printf("  - %s\n", dir)
+
+	// Show configured snapshots
+	fmt.Printf("Snapshots:\n")
+	for _, name := range v.Config.SnapshotNames() {
+		snap := v.Config.Snapshots[name]
+		fmt.Printf("  %s:\n", name)
+		for _, path := range snap.Paths {
+			fmt.Printf("    - %s\n", path)
+		}
+		if len(snap.Exclude) > 0 {
+			fmt.Printf("    exclude: %s\n", strings.Join(snap.Exclude, ", "))
+		}
 	}
 
 	// Global exclude patterns
 	if len(v.Config.Exclude) > 0 {
-		fmt.Printf("Exclude Patterns: %s\n", strings.Join(v.Config.Exclude, ", "))
+		fmt.Printf("Global Exclude:  %s\n", strings.Join(v.Config.Exclude, ", "))
 	}
 
 	fmt.Printf("Compression:     zstd level %d\n", v.Config.CompressionLevel)