Fresh start: replace with naxIO/netfox-cs-sample foundation

Complete replacement of the tactical-shooter project with the
netfox-cs-sample (MIT) — a CS 1.6 inspired multiplayer FPS built
with Godot 4 and netfox.

## What's new
- Full CS-style gameplay: teams (T/CT), rounds, economy, buy menu
- 6 weapons: Knife, Glock, USP, AK-47, M4A1, AWP
- Bomb plant/defuse with 2 bombsites
- Flashbang & smoke grenades
- Proper netfox rollback netcode at 64 tick
- Network popup UI for host/join
- HUD, crosshair, round timer, scoreboard
- All netfox singletons registered as autoloads (works in exported builds)

## Architecture
- Listen-server (host from client, no dedicated server binary)
- Multiplayer-fps game lives at examples/multiplayer-fps/
- Netfox addons registered as autoloads for exported build compat
- Godot 4.7 with Forward+ renderer

## Removed
- Old headless-server architecture (client_main, server_main, player.gd, etc.)
- Custom netfox bootstrap with ENet fallback
- Old ChaffGames FPS template (2,420 lines, 844 KB)
- SimulationServer GDExtension stub
- Godot-jolt physics (netfox sample uses default Godot physics)
- Duplicate weapon_data.gd, anti_cheat.gd, round_manager.gd, etc.
- Server browser API Python venv (87 MB)
- test_range map and modular assets

## Preserved
- Git history
- Server config at config/default_server_config.cfg
- Windows export preset
- Build directory (gitignored)

Co-authored-by: naxIO <naxIO@users.noreply.github.com>

examples/single-player/README.md

@@ -0,0 +1,12 @@
+# Single player example
+
+A simple demo game, completely lacking multiplayer functionality, to serve as a
+baseline for comparisons.
+
+To edit and/or run, open the Godot project in the repository root, and open the
+scene in this directory.
+
+Compare it with:
+* [Simple example](../multiplayer-simple)
+* [Example with netfox](../multiplayer-netfox)
+

examples/single-player/characters/player.tscn

@@ -0,0 +1,16 @@
+[gd_scene load_steps=4 format=3 uid="uid://dlj5m010hpg2"]
+
+[ext_resource type="Script" path="res://examples/single-player/scripts/player.gd" id="1_biuhe"]
+
+[sub_resource type="CapsuleShape3D" id="CapsuleShape3D_t2650"]
+
+[sub_resource type="CapsuleMesh" id="CapsuleMesh_vogks"]
+
+[node name="Player" type="CharacterBody3D"]
+script = ExtResource("1_biuhe")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
+shape = SubResource("CapsuleShape3D_t2650")
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="."]
+mesh = SubResource("CapsuleMesh_vogks")

examples/single-player/scripts/player.gd

@@ -0,0 +1,24 @@
+extends CharacterBody3D
+
+@export var speed = 5.0
+
+# Get the gravity from the project settings to be synced with RigidBody nodes.
+var gravity = ProjectSettings.get_setting(&"physics/3d/default_gravity")
+
+func _physics_process(delta):
+	# Add the gravity.
+	if not is_on_floor():
+		velocity.y -= gravity * delta
+
+	# Get the input direction and handle the movement/deceleration.
+	# As good practice, you should replace UI actions with custom gameplay actions.
+	var input_dir = Input.get_vector("ui_left", "ui_right", "ui_up", "ui_down")
+	var direction = (transform.basis * Vector3(input_dir.x, 0, input_dir.y)).normalized()
+	if direction:
+		velocity.x = direction.x * speed
+		velocity.z = direction.z * speed
+	else:
+		velocity.x = move_toward(velocity.x, 0, speed)
+		velocity.z = move_toward(velocity.z, 0, speed)
+
+	move_and_slide()

examples/single-player/scripts/player.gd.uid

@@ -0,0 +1 @@
+uid://21rp7windgd0

examples/single-player/single-player.tscn

@@ -0,0 +1,68 @@
+[gd_scene load_steps=5 format=3 uid="uid://grxmiwysyb46"]
+
+[ext_resource type="PackedScene" uid="uid://dlj5m010hpg2" path="res://examples/single-player/characters/player.tscn" id="1_6simv"]
+
+[sub_resource type="ProceduralSkyMaterial" id="ProceduralSkyMaterial_rrbfu"]
+
+[sub_resource type="Sky" id="Sky_1tr2y"]
+sky_material = SubResource("ProceduralSkyMaterial_rrbfu")
+
+[sub_resource type="Environment" id="Environment_ef1wp"]
+background_mode = 2
+sky = SubResource("Sky_1tr2y")
+
+[node name="Game Scene" type="Node3D"]
+
+[node name="Map" type="Node" parent="."]
+
+[node name="CSGCombiner3D" type="CSGCombiner3D" parent="Map"]
+use_collision = true
+
+[node name="CSGFloor" type="CSGBox3D" parent="Map/CSGCombiner3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -0.25, 0)
+size = Vector3(16, 0.5, 16)
+
+[node name="CSGWall" type="CSGBox3D" parent="Map/CSGCombiner3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 8)
+size = Vector3(16, 2, 1)
+
+[node name="CSGWall2" type="CSGBox3D" parent="Map/CSGCombiner3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, -8)
+size = Vector3(16, 2, 1)
+
+[node name="CSGWall3" type="CSGBox3D" parent="Map/CSGCombiner3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 8, 1, 0)
+size = Vector3(1, 2, 16)
+
+[node name="CSGWall4" type="CSGBox3D" parent="Map/CSGCombiner3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -8, 1, 0)
+size = Vector3(1, 2, 16)
+
+[node name="CSGCorner" type="CSGCylinder3D" parent="Map/CSGCombiner3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 8, 1, 8)
+
+[node name="CSGCorner2" type="CSGCylinder3D" parent="Map/CSGCombiner3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 8, 1, -8)
+
+[node name="CSGCorner3" type="CSGCylinder3D" parent="Map/CSGCombiner3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -8, 1, -8)
+
+[node name="CSGCorner4" type="CSGCylinder3D" parent="Map/CSGCombiner3D"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -8, 1, 8)
+
+[node name="Environment" type="Node" parent="."]
+
+[node name="DirectionalLight3D" type="DirectionalLight3D" parent="Environment"]
+transform = Transform3D(0.5, 0.612372, -0.612372, 0, 0.707107, 0.707107, 0.866025, -0.353553, 0.353553, -6.7361, 8.77817, 3.88909)
+shadow_enabled = true
+
+[node name="Camera3D" type="Camera3D" parent="Environment"]
+transform = Transform3D(1, 0, 0, 0, 0.5, 0.866025, 0, -0.866025, 0.5, 0, 14.3564, 8.86602)
+
+[node name="WorldEnvironment" type="WorldEnvironment" parent="Environment"]
+environment = SubResource("Environment_ef1wp")
+
+[node name="Players" type="Node" parent="."]
+
+[node name="Player" parent="Players" instance=ExtResource("1_6simv")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0)