feat: implement player movement controller and initial weapon framework including double barrel shotgun and explosive projectiles

weapons/double_barrel_shotgun.gd

@@ -146,12 +146,11 @@ func _apply_impulse() -> void:
 	var push_dir = camera.global_transform.basis.z.normalized()
 	
 	# Apply impulse to player velocity
-	player.velocity += push_dir * impulse_strength
-	
-	# Small hack to ensure we aren't considered on floor if we shoot down
-	if push_dir.y > 0:
-		# Just slightly lift the player to break floor contact immediately
-		player.position.y += 0.05
+	var final_force = push_dir * impulse_strength
+	if multiplayer.has_multiplayer_peer() and multiplayer.multiplayer_peer is not OfflineMultiplayerPeer:
+		player.server_apply_impulse.rpc_id(1, final_force)
+	else:
+		player.apply_impulse(final_force)
 
 func _play_muzzle_flash() -> void:
 	if muzzle_flash: