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/rollback-fps/scripts/player-input.gd

@@ -0,0 +1,48 @@
+extends BaseNetInput
+
+@export var mouse_sensitivity: float = 1.0
+var override_mouse: bool = false
+
+# Input variables
+var mouse_rotation: Vector2 = Vector2.ZERO
+var look_angle: Vector2 = Vector2.ZERO
+var movement: Vector3 = Vector3.ZERO
+var fire: bool = false
+var jump: bool = false
+
+func _notification(what):
+	if what == NOTIFICATION_WM_WINDOW_FOCUS_IN:
+		Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)
+		override_mouse = false
+		
+func _input(event: InputEvent) -> void:
+	if !is_multiplayer_authority(): return
+	
+	if event is InputEventMouseMotion:
+		mouse_rotation.y += event.relative.x * mouse_sensitivity
+		mouse_rotation.x += event.relative.y * mouse_sensitivity
+		
+	if event.is_action_pressed("escape"):
+		Input.set_mouse_mode(Input.MOUSE_MODE_VISIBLE)
+		override_mouse = true
+
+func _ready():
+	super()
+	Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)
+
+func _gather():
+	# Get the input direction and handle the movement/deceleration.
+	# As good practice, you should replace UI actions with custom gameplay actions.
+	var mx = Input.get_axis("move_west", "move_east")
+	var mz = Input.get_axis("move_north", "move_south")
+	movement = Vector3(mx, 0, mz)
+
+	jump = Input.is_action_pressed("move_jump")
+	fire = Input.is_action_pressed("mouse_weapon_fire")
+	
+	if override_mouse:
+		look_angle = Vector2.ZERO
+		mouse_rotation = Vector2.ZERO
+	else:
+		look_angle = Vector2(-mouse_rotation.y, -mouse_rotation.x)
+		mouse_rotation = Vector2.ZERO