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/custom_theme/main.html

@@ -0,0 +1,31 @@
+{% extends "base.html" %}
+
+{%- block extrahead %}
+  <script src="https://giscus.app/client.js"
+          data-repo="foxssake/netfox"
+          data-repo-id="R_kgDOKBON2A"
+          data-category="Docs"
+          data-category-id="DIC_kwDOKBON2M4Clib_"
+          data-mapping="title"
+          data-strict="0"
+          data-reactions-enabled="1"
+          data-emit-metadata="0"
+          data-input-position="top"
+          data-theme="light"
+          data-lang="en"
+          data-loading="lazy"
+          crossorigin="anonymous"
+          async>
+  </script>
+{% endblock %}
+
+{%- block footer %}
+  <hr>
+  <h2>User discussion</h2>
+  <div class="giscus" ></div>
+  <hr>
+  {%- if config.copyright %}
+      <p>{{ config.copyright }}</p>
+  {%- endif %}
+  <p>{% trans mkdocs_link='<a href="https://www.mkdocs.org/">MkDocs</a>' %}Documentation built with {{ mkdocs_link }}.{% endtrans %}</p>
+{%- endblock %}