chore: initial project structure

.gitignore

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+# Binaries
+*.exe
+*.dll
+*.so
+*.dylib
+*.test
+*.out
+
+# Go
+vendor/
+go.sum
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db

README.md

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+# MrixsCraft Launcher
+
+Minecraft лаунчер на Go с GUI на Fyne.
+
+## Сборка
+
+```bash
+go build -o mrixscraft-launcher ./cmd/launcher
+```
+
+## Запуск
+
+```bash
+go run ./cmd/launcher
+```

cmd/launcher/main.go

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+package main
+
+import (
+	"fmt"
+
+	"fyne.io/fyne/v2/app"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/widget"
+)
+
+func main() {
+	fmt.Println("MrixsCraft Launcher starting...")
+
+	a := app.New()
+	w := a.NewWindow("MrixsCraft Launcher")
+	w.Resize(fyne.NewSize(800, 600))
+
+	w.SetContent(container.NewVBox(
+		widget.NewLabel("MrixsCraft Launcher"),
+	))
+
+	w.ShowAndRun()
+}

go.mod

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+module github.com/Mrixs/MrixsCraft-launcher
+
+go 1.22
+
+require fyne.io/fyne/v2 v2.4.5

internal/auth/auth.go

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+// package auth handles Yggdrasil authentication (login, refresh, validate).
+package auth

internal/config/config.go

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+// package config manages launcher configuration (launcher.json, system paths).
+package config

internal/fetcher/fetcher.go

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+// package fetcher handles HTTP downloads and SHA-1 verification.
+package fetcher

internal/java/java.go

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+// package java manages portable JRE downloads and detection.
+package java

internal/launch/launch.go

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+// package launch handles Minecraft process launching (argument interpolation, classpath).
+package launch

internal/selfupdate/selfupdate.go

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+// package selfupdate handles launcher auto-updates via go-selfupdate.
+package selfupdate

internal/ui/components/components.go

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+// package components provides reusable Fyne widgets (avatar, progress bar).
+package components

internal/ui/screens/screens.go

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+// package screens implements application screens (login, main menu, settings).
+package screens

internal/ui/theme/theme.go

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+// package theme defines the custom Fyne theme (Minecraft-style colors, fonts).
+package theme

internal/ui/ui.go

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+// package ui contains Fyne GUI code (main window, theme, navigation).
+package ui

pkg/utils/utils.go

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+// package utils provides shared utility functions (SHA-1, ZIP, etc.).
+package utils