feat: implement double barrel shotgun weapon with procedural sound generation

weapons/double_barrel_shotgun.gd

@@ -10,6 +10,8 @@ var reload_timer: float = 0.0
 var player: CharacterBody3D
 var camera: Camera3D
 var muzzle_flash: OmniLight3D
+var fire_sound: AudioStreamPlayer3D
+var reload_sound: AudioStreamPlayer3D
 
 func _ready() -> void:
 	set_process_input(true)
@@ -61,6 +63,16 @@ func _build_model() -> void:
 	muzzle_flash.omni_range = 4.0
 	muzzle_flash.position = Vector3(0, 0.03, -0.45)
 	add_child(muzzle_flash)
+	
+	# Audio Players
+	fire_sound = AudioStreamPlayer3D.new()
+	fire_sound.stream = load("res://assets/sounds/shotgun_fire.wav")
+	fire_sound.position = muzzle_flash.position
+	add_child(fire_sound)
+	
+	reload_sound = AudioStreamPlayer3D.new()
+	reload_sound.stream = load("res://assets/sounds/shotgun_reload.wav")
+	add_child(reload_sound)
 
 func _process(delta: float) -> void:
 	if reloading:
@@ -87,8 +99,13 @@ func _input(event: InputEvent) -> void:
 	
 	if event.is_action_pressed("reload"):
 		if shells < 2 and not reloading:
-			reloading = true
-			reload_timer = reload_time
+			_start_reload()
+
+func _start_reload() -> void:
+	reloading = true
+	reload_timer = reload_time
+	if reload_sound:
+		reload_sound.play()
 
 func _try_fire() -> void:
 	if shells > 0 and not reloading:
@@ -97,16 +114,16 @@ func _try_fire() -> void:
 		_apply_impulse()
 		_shoot_hitscan()
 		_play_muzzle_flash()
+		if fire_sound:
+			fire_sound.play()
 		
 		# Start reload timer if we just shot the LAST shell
 		if shells == 0:
-			reloading = true
-			reload_timer = reload_time
+			_start_reload()
 			
 	elif shells == 0 and not reloading:
 		# Empty click, force reload
-		reloading = true
-		reload_timer = reload_time
+		_start_reload()
 
 func _apply_impulse() -> void:
 	if not player or not camera: