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/input-gathering/characters/player.tscn

@@ -0,0 +1,33 @@
+[gd_scene load_steps=7 format=3 uid="uid://b5qybas0mp0nd"]
+
+[ext_resource type="Script" path="res://examples/input-gathering/scripts/player.gd" id="1_rea48"]
+[ext_resource type="Script" path="res://addons/netfox/rollback/rollback-synchronizer.gd" id="2_axq31"]
+[ext_resource type="Script" path="res://addons/netfox/tick-interpolator.gd" id="3_hhcvm"]
+[ext_resource type="Script" path="res://examples/input-gathering/scripts/player-input.gd" id="4_kgt2r"]
+
+[sub_resource type="CapsuleShape3D" id="CapsuleShape3D_t2650"]
+
+[sub_resource type="CapsuleMesh" id="CapsuleMesh_vogks"]
+
+[node name="Player" type="CharacterBody3D"]
+script = ExtResource("1_rea48")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
+shape = SubResource("CapsuleShape3D_t2650")
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="."]
+mesh = SubResource("CapsuleMesh_vogks")
+
+[node name="RollbackSynchronizer" type="Node" parent="." node_paths=PackedStringArray("root")]
+script = ExtResource("2_axq31")
+root = NodePath("..")
+state_properties = Array[String]([":position", ":velocity"])
+input_properties = Array[String](["Input:movement", "Input:is_jumping"])
+
+[node name="TickInterpolator" type="Node" parent="." node_paths=PackedStringArray("root")]
+script = ExtResource("3_hhcvm")
+root = NodePath("..")
+properties = Array[String]([":position"])
+
+[node name="Input" type="Node" parent="."]
+script = ExtResource("4_kgt2r")