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>

docs/netfox.extras/guides/window-tiler.md

@@ -0,0 +1,33 @@
+# WindowTiler
+
+A developer convenience feature that automatically tiles the launched windows
+when working from the editor.
+
+![Window Tiler](../assets/window-tiler.gif)
+
+## Limitations
+
+### Borderless mode on Linux
+
+Setting window position and size works inconsistently under Linux at the time
+of writing. Your mileage may vary based on your desktop environment and
+distribution.
+
+In case the windows don't tile properly with *Borderless* enabled, disabling it
+is a fallback.
+
+### Window decorations
+
+At the time of writing, there is no known and consistent way to compensate for
+window decoration size and offset. In practice, this means that windows may
+slightly overlap.
+
+## Configuration
+
+*Auto Tile Windows* Enables auto tiling from editor launches.
+
+*Screen* Which screen number to move and tile the windows to.
+
+*Borderless* Enable borderless mode to make the most out of the screen real
+estate.
+