Phase 8: Headless dedicated server + RCON admin + netfox bootstrap

## Headless Server
- New entry point: scenes/headless_server.tscn + scripts/headless_server.gd
- Loads multiplayer-fps game, strips UI/rendering, auto-hosts ENet server
- Port config via --port arg, SERVER_PORT env, or default 34197
- RCON admin console on port 28960 (configurable via --rcon-port)

## Netfox Headless Bootstrap
- scripts/netfox_headless_bootstrap.gd — preloads all netfox dependency
  scripts in headless mode so class_names register before autoloads parse
- Registered as first autoload in project.godot
- Fixes 'Could not find type' errors for NetfoxLogger, NorayProtocolHandler,
  NetworkClocks, etc.

## RCON Admin
- Ported from old project: scripts/rcon/rcon_server.gd (TCP auth layer)
- scripts/rcon/rcon_command_handler.gd (command dispatch)
- Password via config/rcon_password.cfg, --rcon-password, or RCON_PASSWORD env

## Other Changes
- Added GameEvents stub (lan-bootstrapper dependency)
- Updated project.godot features to 4.7
- Added config/server_config.cfg for operator editing
- Updated RCON paths to new project structure

config/server_config.cfg

@@ -0,0 +1,47 @@
+; Tactical Shooter — Default Server Configuration
+; Copy to user://server_config.cfg or config/server_config.cfg and edit.
+[server]
+server_name="Tactical Shooter Server"
+description=""
+bind_ip="0.0.0.0"
+port=34197
+max_players=16
+password=""
+tick_rate=64
+
+[game]
+round_time_seconds=600
+warmup_time_seconds=60
+friendly_fire=false
+ff_damage_multiplier=0.5
+gravity=-24.0
+respawn_time_seconds=5.0
+spectate_enabled=true
+
+[movement]
+walk_speed=5.0
+sprint_speed=7.0
+crouch_speed=2.0
+jump_velocity=6.0
+acceleration=20.0
+air_acceleration=4.0
+friction=8.0
+
+[match]
+win_limit=3
+time_limit_seconds=0
+map_rotation_mode="sequence"
+maps="test_range"
+
+[rcon]
+enabled=false
+password=""
+port=28960
+
+[logging]
+log_level="info"
+log_file=""
+
+[teams]
+team_count=2
+players_per_team=8