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/forest-brawl/scenes/bomb-projectile.tscn

@@ -0,0 +1,24 @@
+[gd_scene load_steps=6 format=3 uid="uid://8sru5hge6spx"]
+
+[ext_resource type="Script" path="res://examples/forest-brawl/scripts/bomb-projectile.gd" id="1_eudhi"]
+[ext_resource type="PackedScene" uid="uid://cn6ypxuayfwfl" path="res://examples/forest-brawl/models/kenney-platformer-kit/bomb.glb" id="1_lr6uq"]
+[ext_resource type="PackedScene" uid="uid://6212jkmbikjq" path="res://examples/forest-brawl/scenes/explosion.tscn" id="2_r3c2e"]
+[ext_resource type="Script" path="res://addons/netfox/tick-interpolator.gd" id="4_dyck1"]
+
+[sub_resource type="SphereShape3D" id="SphereShape3D_pc5j5"]
+radius = 0.25
+
+[node name="Bomb Projectile" type="ShapeCast3D"]
+shape = SubResource("SphereShape3D_pc5j5")
+target_position = Vector3(0, 0, 0)
+script = ExtResource("1_eudhi")
+strength = 4.0
+effect = ExtResource("2_r3c2e")
+
+[node name="bomb" parent="." instance=ExtResource("1_lr6uq")]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -0.226921, 0)
+
+[node name="TickInterpolator" type="Node" parent="." node_paths=PackedStringArray("root")]
+script = ExtResource("4_dyck1")
+root = NodePath("..")
+properties = Array[String]([":global_position"])