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>

test/netfox.internals/graph.perf.gd

@@ -0,0 +1,36 @@
+extends VestTest
+
+func get_suite_name() -> String:
+	return "Graph"
+
+func suite():
+	var cases := [
+		["tiny", 16, 2, 2048],
+		["medium", 128, 4, 2048],
+		["large", 1024, 16, 2048]
+	]
+
+	for case in cases:
+		var name := case[0] as String
+		var items := case[1] as int
+		var depth := case[2] as int
+		var batch := case[3] as int
+
+		test("queries - %s graph, %d / %d" % [name, items, depth], func():
+			var graph := _Graph.new()
+			for i in items:
+				for j in depth:
+					graph.link(i, i + j)
+			
+			benchmark("get_linked_from()", func(__):
+				var nodes := graph.get_linked_from(randi() % items)
+			).with_duration(1.).with_batch_size(batch).run()
+			
+			benchmark("get_linked_to()", func(__):
+				var nodes := graph.get_linked_to(randi() % items)
+			).with_duration(1.).with_batch_size(batch).run()
+			
+			benchmark("has_link()", func(__):
+				var nodes := graph.has_link(randi() % items, randi() % items)
+			).with_duration(1.).with_batch_size(batch).run()
+		)