feat(workspace): initialize all seven crates with stubs and blank Bevy window

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

solitaire_app/src/main.rs

@@ -0,0 +1,16 @@
+use bevy::prelude::*;
+
+fn main() {
+    App::new()
+        .add_plugins(
+            DefaultPlugins.set(WindowPlugin {
+                primary_window: Some(Window {
+                    title: "Solitaire Quest".into(),
+                    resolution: (1280.0, 800.0).into(),
+                    ..default()
+                }),
+                ..default()
+            }),
+        )
+        .run();
+}