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/multiplayer-state-machine/scripts/character-states/Idle.gd

@@ -0,0 +1,17 @@
+extends RewindableState
+
+@export var character: CharacterBody3D
+@export var input: PlayerInputStateMachine
+
+func display_enter(_previous, _t):
+	character.color = Color.WHITE
+
+func tick(delta, tick, is_fresh):
+	character.velocity *= NetworkTime.physics_factor
+	character.move_and_slide()
+	character.velocity /= NetworkTime.physics_factor
+	
+	if input.movement != Vector3.ZERO:
+		state_machine.transition(&"Move")
+	elif input.jump:
+		state_machine.transition(&"Jump")

examples/multiplayer-state-machine/scripts/character-states/Idle.gd.uid

@@ -0,0 +1 @@
+uid://bsmb3oeexcu7b

examples/multiplayer-state-machine/scripts/character-states/Jump.gd

@@ -0,0 +1,35 @@
+extends RewindableState
+
+@export var character: CharacterBody3D
+@export var input: PlayerInputStateMachine
+@export var speed = 5.0
+@export var jump_strength = 5.0
+
+# Only enter if the character is on the floor
+func can_enter(_previous_state):
+	return input.jump and character.is_on_floor()
+
+func display_enter(_previous, _t):
+	character.color = Color.BLUE
+
+func enter(_previous_state, _tick):
+	character.velocity.y = jump_strength
+
+func tick(delta, tick, is_fresh):
+	var input_dir = input.movement
+	var direction = (character.transform.basis * Vector3(input_dir.x, 0, input_dir.z)).normalized()
+	if direction:
+		character.velocity.x = direction.x * speed
+		character.velocity.z = direction.z * speed
+	else:
+		character.velocity.x = move_toward(character.velocity.x, 0, speed)
+		character.velocity.z = move_toward(character.velocity.z, 0, speed)
+
+	# move_and_slide assumes physics delta
+	# multiplying velocity by NetworkTime.physics_factor compensates for it
+	character.velocity *= NetworkTime.physics_factor
+	character.move_and_slide()
+	character.velocity /= NetworkTime.physics_factor
+	
+	if character.is_on_floor():
+		state_machine.transition(&"Idle")

examples/multiplayer-state-machine/scripts/character-states/Jump.gd.uid

@@ -0,0 +1 @@
+uid://dhdmqnfrvkwht

examples/multiplayer-state-machine/scripts/character-states/Move.gd

@@ -0,0 +1,29 @@
+extends RewindableState
+
+@export var character: CharacterBody3D
+@export var input: PlayerInputStateMachine
+@export var speed = 5.0
+
+func display_enter(_previous, _t):
+	character.color = Color.RED
+
+func tick(delta, tick, is_fresh):
+	var input_dir = input.movement
+	var direction = (character.transform.basis * Vector3(input_dir.x, 0, input_dir.z)).normalized()
+	if direction:
+		character.velocity.x = direction.x * speed
+		character.velocity.z = direction.z * speed
+	else:
+		character.velocity.x = move_toward(character.velocity.x, 0, speed)
+		character.velocity.z = move_toward(character.velocity.z, 0, speed)
+
+	# move_and_slide assumes physics delta
+	# multiplying velocity by NetworkTime.physics_factor compensates for it
+	character.velocity *= NetworkTime.physics_factor
+	character.move_and_slide()
+	character.velocity /= NetworkTime.physics_factor
+	
+	if input.jump:
+		state_machine.transition(&"Jump")
+	elif input_dir == Vector3.ZERO:
+		state_machine.transition(&"Idle")

examples/multiplayer-state-machine/scripts/character-states/Move.gd.uid

@@ -0,0 +1 @@
+uid://fkgq18vmq5u6