chore: initial project structure

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