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>

addons/netfox/properties/property-history-buffer.gd

@@ -1,28 +0,0 @@
-extends _HistoryBuffer
-class_name _PropertyHistoryBuffer
-
-func get_snapshot(tick: int) -> _PropertySnapshot:
-	if _buffer.has(tick):
-		return _buffer[tick]
-	else:
-		return _PropertySnapshot.new()
-
-func set_snapshot(tick: int, data) -> void:
-	if data is Dictionary:
-		var snapshot := _PropertySnapshot.from_dictionary(data)
-		super(tick, snapshot)
-	elif data is _PropertySnapshot:
-		super(tick, data)
-	else:
-		push_error("Data not a PropertSnapshot! %s" % [data])
-
-func get_history(tick: int) -> _PropertySnapshot:
-	var snapshot = super(tick)
-
-	return snapshot if snapshot else _PropertySnapshot.new()
-
-func trim(earliest_tick_to_keep: int = NetworkRollback.history_start) -> void:
-	super(earliest_tick_to_keep)
-
-func merge(data: _PropertySnapshot, tick:int) -> void:
-	set_snapshot(tick, get_snapshot(tick).merge(data))