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/contributors.md

@@ -0,0 +1,29 @@
+# Contributors
+
+Over time, *netfox* has received multiple important contributions from its
+community. Huge kudos to all of our contributors!
+
+## Special thanks
+
+We'd like to highlight some of our contributors, in no particular order:
+
+* [albertok](https://github.com/albertok)
+    * For being one of the first active members of the community
+    * For contributing multiple features to netfox, including window tiling
+* [DustieDog](https://github.com/DustieDog)
+    * For creating [NetfoxSharp](https://github.com/CyFurStudios/NetfoxSharp)
+    * For contributing to netfox's code quality both with PRs and design
+      discussions
+* [krazyjakee](https://github.com/krazyjakee)
+    * For contributing the rollback-aware state machine and FPS example
+* [TheYellowArchitect](https://github.com/TheYellowArchitect)
+    * For suggesting and contributing to multiple important features such as
+      diff states and input delay
+
+## All contributors
+
+<a href="https://github.com/foxssake/netfox/graphs/contributors">
+  <img src="https://contrib.rocks/image?repo=foxssake/netfox" />
+</a>
+
+Image generated by [contrib.rocks](https://contrib.rocks).