chore: initial project structure

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