chore(simulation): add debug logging for received inputs

Log each received player input at DEBUG level with tick and action,
useful for diagnosing input pipeline issues during live testing.

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

server/src/bridge/mod.rs

@@ -72,6 +72,9 @@ pub fn receive_bridge_inputs(
     let Some(bridge) = bridge else { return };
     match bridge.receive_inputs() {
         Ok(inputs) => {
+            for input in &inputs {
+                tracing::debug!("Received input: tick={} action={:?}", input.tick, input.action);
+            }
             for input in inputs {
                 input_queue.push(input);
             }