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-fps/scripts/data/weapon_registry.gd

@@ -0,0 +1,24 @@
+extends Node
+
+const NONE := 0
+const KNIFE := 1
+const GLOCK := 2
+const USP := 3
+const AK47 := 4
+const M4A1 := 5
+const AWP := 6
+
+const WEAPONS := {
+	1: preload("res://examples/multiplayer-fps/scripts/data/weapons/knife.tres"),
+	2: preload("res://examples/multiplayer-fps/scripts/data/weapons/glock.tres"),
+	3: preload("res://examples/multiplayer-fps/scripts/data/weapons/usp.tres"),
+	4: preload("res://examples/multiplayer-fps/scripts/data/weapons/ak47.tres"),
+	5: preload("res://examples/multiplayer-fps/scripts/data/weapons/m4a1.tres"),
+	6: preload("res://examples/multiplayer-fps/scripts/data/weapons/awp.tres"),
+}
+
+static func get_weapon(id: int) -> WeaponData:
+	return WEAPONS.get(id, null)
+
+static func get_default_pistol(team: int) -> int:
+	return GLOCK if team == 0 else USP