Release 1.0.0: rename to NoMines, add leaderboard, theme support and release metadata

- Rename app/binary/app-id to nomines (io.github.bemagri.nomines), config dir
  moves to ~/.config/nomines with legacy path fallback
- Add persistent best-time leaderboard (Glib::KeyFile)
- Theme-aware board following system light/dark preference
- Beveled 3D cells, confetti win animation, keyboard shortcuts,
  right-click chording, per-difficulty window sizing
- Add AppStream metainfo, validate desktop file and metainfo via meson tests
- Fix license metadata to GPL-3.0-or-later and real homepage

resources/io.github.bemagri.nomines.desktop

@@ -0,0 +1,11 @@
+[Desktop Entry]
+Name=NoMines
+GenericName=Minesweeper Game
+Comment=Classic minesweeper game with modern GTK UI
+Keywords=game;puzzle;mine;
+Exec=nomines
+Icon=nomines
+Terminal=false
+Type=Application
+Categories=Game;LogicGame;
+StartupNotify=true