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-prediction/input.gd

@@ -0,0 +1,39 @@
+extends BaseNetInput
+
+var movement: Vector3
+var confidence: float = 1.
+
+@onready var _rollback_synchronizer := $"../RollbackSynchronizer" as RollbackSynchronizer
+
+func _ready():
+	super()
+	NetworkRollback.after_prepare_tick.connect(_predict)
+
+func _gather():
+	movement = Vector3(
+		Input.get_axis("move_east", "move_west"),
+		Input.get_action_strength("move_jump"),
+		Input.get_axis("move_south", "move_north")
+	)
+
+func _predict(_t):
+	if not _rollback_synchronizer.is_predicting():
+		# Not predicting, nothing to do
+		confidence = 1.
+		return
+	
+	if not _rollback_synchronizer.has_input():
+		confidence = 0.
+		return
+	
+	# Decay input over a short time
+	var decay_time := NetworkTime.seconds_to_ticks(.05)
+	var input_age := _rollback_synchronizer.get_input_age()
+	
+	# **ALWAYS** cast either side to float, otherwise the integer-integer 
+	# division yields either 1 or 0 confidence
+	confidence = input_age / float(decay_time)
+	confidence = clampf(1. - confidence, 0., 1.)
+
+	# Modulate input based on confidence
+	movement *= confidence