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/cli/snapshot.go

@@ -35,14 +35,19 @@ func newSnapshotCreateCommand() *cobra.Command {
 	opts := &vaultik.SnapshotCreateOptions{}
 
 	cmd := &cobra.Command{
-		Use:   "create",
-		Short: "Create a new snapshot",
-		Long: `Creates a new snapshot of the configured directories.
+		Use:   "create [snapshot-names...]",
+		Short: "Create new snapshots",
+		Long: `Creates new snapshots of the configured directories.
 
-Config is located at /etc/vaultik/config.yml by default, but can be overridden by 
+If snapshot names are provided, only those snapshots are created.
+If no names are provided, all configured snapshots are created.
+
+Config is located at /etc/vaultik/config.yml by default, but can be overridden by
 specifying a path using --config or by setting VAULTIK_CONFIG to a path.`,
-		Args: cobra.NoArgs,
+		Args: cobra.ArbitraryArgs,
 		RunE: func(cmd *cobra.Command, args []string) error {
+			// Pass snapshot names from args
+			opts.Snapshots = args
 			// Use unified config resolution
 			configPath, err := ResolveConfigPath()
 			if err != nil {
@@ -95,6 +100,7 @@ specifying a path using --config or by setting VAULTIK_CONFIG to a path.`,
 	cmd.Flags().BoolVar(&opts.Daemon, "daemon", false, "Run in daemon mode with inotify monitoring")
 	cmd.Flags().BoolVar(&opts.Cron, "cron", false, "Run in cron mode (silent unless error)")
 	cmd.Flags().BoolVar(&opts.Prune, "prune", false, "Delete all previous snapshots and unreferenced blobs after backup")
+	cmd.Flags().BoolVar(&opts.SkipErrors, "skip-errors", false, "Skip file read errors (log them loudly but continue)")
 
 	return cmd
 }