feat: integrate ChaffGames FPS template as local player controller

Replaces the overhead box-mesh view with a full FPS character:

- mouse look, WASD movement, jump (Space), crouch (C), sprint (Shift), lean (Q/E)

- 6 weapons (LMB shoot, R reload, scroll switch, F melee, G drop)

- Crosshair HUD, ammo counter, sprint bar

- Client sends position to server at 20Hz for multiplayer visibility

- Server broadcasts positions to all peers

- Remote players shown as boxes (placeholder)

source: https://godotengine.org/asset-library/asset/2652 (MIT license)

client/template/scripts/Projectiles/shotgun_projectile.gd

@@ -0,0 +1,23 @@
+extends Projectile
+
+@onready var shotgun_pattern: Path2D = $shotgun_pattern
+@export_range(0.0,20.0) var Randomness = 10.0
+@export var Split_damage: bool = false
+var Spray_Vector
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	Spray_Vector = shotgun_pattern.get_curve()
+	return super._ready()
+
+func _Set_Projectile(_damage: int = 0,_spread:Vector2 = Vector2.ZERO, _Range: int = 1000, origin_point: Vector3 = Vector3.ZERO):
+	randomize()
+	damage = _damage/(max(Spray_Vector.get_point_count()*float(Split_damage),1))
+	
+	for point in Spray_Vector.get_point_count():
+		var SprayPoint:Vector2 = Spray_Vector.get_point_position(point)
+		
+		SprayPoint.x = SprayPoint.x + randf_range(-Randomness, Randomness)
+		SprayPoint.y = SprayPoint.y + randf_range(-Randomness, Randomness)
+		
+		Fire_Projectile(SprayPoint,_Range,Rigid_Body_Projectile, origin_point)