Consolidate CLI verbs; retire overlapping commands

The verb surface accumulated overlapping cleanup commands. Consolidate
so each cleanup verb has one meaning:

- Rename 'database purge' -> 'database delete'. The command removes the
  SQLite file entirely; "purge" wrongly suggested purging contents.
- Fold 'snapshot cleanup' into 'prune'. Prune now runs three passes:
  reconcile local snapshots against the remote (previously the
  standalone cleanup command), drop orphaned local rows, then delete
  unreferenced remote blobs. One command, one mental model.
- Delete 'store info'. Its output was a strict subset of 'remote info',
  which already prints storage type + location. Any user reaching for
  either should reach for 'remote info'.
- Drop 'snapshot remove --all'. It duplicated 'remote nuke --force'.
  'remote nuke' is the single supported entry point for wiping the
  destination store.

Also update the storage-binding error message to reference the new
'vaultik database delete' name.

internal/cli/snapshot.go

@@ -25,7 +25,6 @@ func NewSnapshotCommand() *cobra.Command {
 	cmd.AddCommand(newSnapshotPurgeCommand())
 	cmd.AddCommand(newSnapshotVerifyCommand())
 	cmd.AddCommand(newSnapshotRemoveCommand())
-	cmd.AddCommand(newSnapshotCleanupCommand())
 	cmd.AddCommand(newSnapshotRestoreCommand())
 
 	return cmd
@@ -322,7 +321,7 @@ func newSnapshotRemoveCommand() *cobra.Command {
 	opts := &vaultik.RemoveOptions{}
 
 	cmd := &cobra.Command{
-		Use:     "remove [snapshot-id]",
+		Use:     "remove <snapshot-id>",
 		Aliases: []string{"rm"},
 		Short:   "Remove a snapshot from local index and remote metadata",
 		Long: `Removes a snapshot.
@@ -341,20 +340,13 @@ If the remote is unreachable, the local-database removal still completes
 and a warning is emitted; rerun 'vaultik prune' once the destination store
 is reachable to finish remote cleanup.
 
-Use --all --force to remove all snapshots.`,
+To wipe the entire destination store and start over, use 'vaultik remote
+nuke --force' — it is the single supported entry point for that.`,
 		Args: func(cmd *cobra.Command, args []string) error {
-			all, _ := cmd.Flags().GetBool("all")
-			if all {
-				if len(args) > 0 {
-					_ = cmd.Help()
-					return fmt.Errorf("--all cannot be used with a snapshot ID")
-				}
-				return nil
-			}
 			if len(args) != 1 {
 				_ = cmd.Help()
 				if len(args) == 0 {
-					return fmt.Errorf("snapshot ID required (or use --all --force)")
+					return fmt.Errorf("snapshot ID required")
 				}
 				return fmt.Errorf("expected 1 argument, got %d", len(args))
 			}
@@ -381,12 +373,7 @@ Use --all --force to remove all snapshots.`,
 						lc.Append(fx.Hook{
 							OnStart: func(ctx context.Context) error {
 								go func() {
-									var err error
-									if opts.All {
-										_, err = v.RemoveAllSnapshots(opts)
-									} else {
-										_, err = v.RemoveSnapshot(args[0], opts)
-									}
+									_, err := v.RemoveSnapshot(args[0], opts)
 									if err != nil {
 										if err != context.Canceled {
 											if !opts.JSON {
@@ -417,65 +404,6 @@ Use --all --force to remove all snapshots.`,
 	cmd.Flags().BoolVar(&opts.DryRun, "dry-run", false, "Show what would be removed without removing")
 	cmd.Flags().BoolVar(&opts.JSON, "json", false, "Output result as JSON")
 	cmd.Flags().BoolVar(&opts.LocalOnly, "local-only", false, "Skip remote cleanup; only touch the local index")
-	cmd.Flags().BoolVar(&opts.All, "all", false, "Remove all snapshots (requires --force)")
-
-	return cmd
-}
-
-// newSnapshotCleanupCommand creates the 'snapshot cleanup' subcommand
-func newSnapshotCleanupCommand() *cobra.Command {
-	cmd := &cobra.Command{
-		Use:   "cleanup",
-		Short: "Remove stale local snapshot records not found in remote storage",
-		Long: `Removes local database records for snapshots whose metadata no longer
-exists in remote storage. These are typically left behind by incomplete
-or interrupted backups.
-
-This command does not delete anything from remote storage.`,
-		Args: cobra.NoArgs,
-		RunE: func(cmd *cobra.Command, args []string) error {
-			configPath, err := ResolveConfigPath()
-			if err != nil {
-				return err
-			}
-
-			rootFlags := GetRootFlags()
-			return RunWithApp(cmd.Context(), AppOptions{
-				ConfigPath: configPath,
-				LogOptions: log.LogOptions{
-					Verbose: rootFlags.Verbose,
-					Debug:   rootFlags.Debug,
-					Quiet:   rootFlags.Quiet,
-				},
-				Modules: []fx.Option{},
-				Invokes: []fx.Option{
-					fx.Invoke(func(v *vaultik.Vaultik, lc fx.Lifecycle) {
-						lc.Append(fx.Hook{
-							OnStart: func(ctx context.Context) error {
-								go func() {
-									if err := v.CleanupLocalSnapshots(); err != nil {
-										if err != context.Canceled {
-											log.Error("Cleanup failed", "error", err)
-											ReportError("Cleanup failed: %v", err)
-											os.Exit(1)
-										}
-									}
-									if err := v.Shutdowner.Shutdown(); err != nil {
-										log.Error("Failed to shutdown", "error", err)
-									}
-								}()
-								return nil
-							},
-							OnStop: func(ctx context.Context) error {
-								v.Cancel()
-								return nil
-							},
-						})
-					}),
-				},
-			})
-		},
-	}
 
 	return cmd
 }