refactor: move pkg/ to internal/ and update imports

Restructure project by relocating package contents from pkg/ to internal/ to better reflect internal-only usage. This commit is initial step to prepare project for public api

internal/gen/funcs.go

@@ -0,0 +1,39 @@
+// This file was originally part of the project "LURE - Linux User REpository", created by Elara Musayelyan.
+// It has been modified as part of "ALR - Any Linux Repository" by the ALR Authors.
+//
+// ALR - Any Linux Repository
+// Copyright (C) 2025 The ALR Authors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package gen
+
+import (
+	"strings"
+	"text/template"
+)
+
+// Определяем переменную funcs типа template.FuncMap, которая будет использоваться для
+// предоставления пользовательских функций в шаблонах
+var funcs = template.FuncMap{
+	// Функция "tolower" использует strings.ToLower
+	// для преобразования строки в нижний регистр
+	"tolower": strings.ToLower,
+
+	// Функция "firstchar" — это лямбда-функция, которая берет строку
+	// и возвращает её первый символ
+	"firstchar": func(s string) string {
+		return s[:1]
+	},
+}