chore(deps): migrate to Bevy 0.16, axum 0.8, and other package updates

- Bump bevy 0.15 → 0.16; fixes all breaking API changes:
  ChildBuilder → ChildSpawnerCommands, Parent → ChildOf,
  despawn_descendants → despawn_related::<Children>(),
  despawn_recursive → despawn (now recursive by default),
  EventWriter::send → write, Query::{get_single,get_single_mut}
  → {single,single_mut}, ChildOf::get → parent()
- Bump axum 0.7 → 0.8; remove axum::async_trait from FromRequestParts
- Bump tower_governor 0.4 → 0.8; fix GovernorLayer::new() API
- Bump jsonwebtoken 9 → 10 with rust_crypto feature only
- Bump thiserror 1 → 2, dirs 5 → 6, bcrypt 0.15 → 0.19,
  reqwest 0.12 → 0.13 (rustls feature rename)
- Regenerate .sqlx offline cache for sqlx compile-time query checks

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

solitaire_engine/src/card_animation/interaction.rs

@@ -236,13 +236,13 @@ pub(crate) fn drain_input_buffer(
     }
     match buffer.queue.pop_front() {
         Some(BufferedInput::Move { from }) => {
-            move_events.send(from);
+            move_events.write(from);
         }
         Some(BufferedInput::Draw) => {
-            draw_events.send(DrawRequestEvent);
+            draw_events.write(DrawRequestEvent);
         }
         Some(BufferedInput::Undo) => {
-            undo_events.send(UndoRequestEvent);
+            undo_events.write(UndoRequestEvent);
         }
         None => {}
     }
@@ -259,9 +259,9 @@ fn cursor_world(
     windows: &Query<&Window, With<PrimaryWindow>>,
     cameras: &Query<(&Camera, &GlobalTransform)>,
 ) -> Option<Vec2> {
-    let window = windows.get_single().ok()?;
+    let window = windows.single().ok()?;
     let cursor = window.cursor_position()?;
-    let (camera, camera_transform) = cameras.get_single().ok()?;
+    let (camera, camera_transform) = cameras.single().ok()?;
     camera.viewport_to_world_2d(camera_transform, cursor).ok()
 }