refactor: implement template-driven node tree and human-readable vault layout

Unified Node model: added template_id, fs_path, archived, sort_order fields.
Template registry: system templates embedded as JSON (folder/project/client/
document/recipe), with Registry for enabled/disabled/filtered access.
SafeDisplayNameToPathSegment: human-readable path segments with Cyrillic
support, illegal char replacement, uniqueness via numeric suffixes.
Sidebar refactored: system views (Today/Inbox/Activity) separate from
workspace tree. Creation menu built dynamically from enabled templates.
Create/Rename/Move: physical folder operations with fs_path update,
recursive descendant path updates.
DB migration 012: adds template_id, fs_path, archived columns.
Vault migration command: rebuilds fs_path for existing nodes.
Tests: safename, registry, node model, repository integration.
Docs: VAULT_LAYOUT.md, TEMPLATES.md, PLAN.md updated.
i18n: nav.system, nav.workspace, template.*, common.rename/archive,
migrate.* keys added to ru.json and en.json.

cmd/verstak/node_cmd.go

@@ -18,7 +18,11 @@ func runNodeCreate(vault, parentID, typ, title string) error {
 	defer db.Close()
 
 	repo := nodes.NewRepository(db)
-	n, err := repo.Create(parentID, typ, title, "")
+	var pid *string
+	if parentID != "" {
+		pid = &parentID
+	}
+	n, err := repo.Create(pid, typ, title, 0, "", "")
 	if err != nil {
 		return err
 	}
@@ -65,7 +69,7 @@ func runNodeList(vault, parentID string) error {
 	repo := nodes.NewRepository(db)
 	var list []nodes.Node
 	if parentID == "" {
-		list, err = repo.ListRoots(false, "")
+		list, err = repo.ListRoots(false)
 	} else {
 		list, err = repo.ListChildren(parentID, false)
 	}
@@ -87,7 +91,11 @@ func runNodeMove(vault, id, parentID string, sortOrder int) error {
 	defer db.Close()
 
 	repo := nodes.NewRepository(db)
-	if err := repo.Move(id, parentID, sortOrder); err != nil {
+	var pid *string
+	if parentID != "" {
+		pid = &parentID
+	}
+	if err := repo.Move(id, pid, sortOrder); err != nil {
 		return err
 	}
 	fmt.Println("moved")