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/build/checker.go

@@ -0,0 +1,74 @@
+// 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 build
+
+import (
+	"context"
+	"log/slog"
+
+	"github.com/leonelquinteros/gotext"
+
+	"gitea.plemya-x.ru/Plemya-x/ALR/internal/cliutils"
+	"gitea.plemya-x.ru/Plemya-x/ALR/internal/cpu"
+	"gitea.plemya-x.ru/Plemya-x/ALR/internal/manager"
+	"gitea.plemya-x.ru/Plemya-x/ALR/internal/types"
+)
+
+type Checker struct {
+	mgr manager.Manager
+}
+
+func (c *Checker) PerformChecks(
+	ctx context.Context,
+	input *BuildInput,
+	vars *types.BuildVars,
+) (bool, error) {
+	if !cpu.IsCompatibleWith(cpu.Arch(), vars.Architectures) { // Проверяем совместимость архитектуры
+		cont, err := cliutils.YesNoPrompt(
+			ctx,
+			gotext.Get("Your system's CPU architecture doesn't match this package. Do you want to build anyway?"),
+			input.opts.Interactive,
+			true,
+		)
+		if err != nil {
+			return false, err
+		}
+
+		if !cont {
+			return false, nil
+		}
+	}
+
+	installed, err := c.mgr.ListInstalled(nil)
+	if err != nil {
+		return false, err
+	}
+
+	filename, err := pkgFileName(input, vars)
+	if err != nil {
+		return false, err
+	}
+
+	if instVer, ok := installed[filename]; ok { // Если пакет уже установлен, выводим предупреждение
+		slog.Warn(gotext.Get("This package is already installed"),
+			"name", vars.Name,
+			"version", instVer,
+		)
+	}
+
+	return true, nil
+}