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/Weapon_State_Machine/bullet.gd

@@ -0,0 +1,15 @@
+extends RigidBody3D
+
+signal Hit_Successfull
+
+var damage: int = 0
+
+func _on_body_entered(body):
+	if body.is_in_group("Target") && body.has_method("Hit_Successful"):
+		body.Hit_Successful(damage)
+		emit_signal("Hit_Successfull")
+
+	queue_free()
+
+func _on_timer_timeout():
+	queue_free()