Fix Windows export: include examples/shared/ dependencies

The export_presets.cfg excluded examples/shared/** from both Windows
Desktop and Linux Server presets. The multiplayer-fps.tscn main scene
depends on files in this directory (network-popup.tscn, async.gd,
simple-time-display.gd) — without them the exported binary crashes
on startup with 'Can't load dependency' errors.

- Remove examples/shared/** from Windows Desktop exclude_filter
- Remove examples/shared/** from Linux Server exclude_filter

tactical-shooter.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=Tactical Shooter — dedicated game server
+After=network.target
+
+[Service]
+Type=simple
+WorkingDirectory=/home/oplabs/tactical-shooter
+ExecStart=/home/oplabs/.local/bin/godot --headless --scene res://scenes/headless_server.tscn -- --port 34197 --rcon-password changeme
+Restart=on-failure
+RestartSec=5
+StandardOutput=journal
+StandardError=journal
+Environment=SERVER_PORT=34197
+Environment=RCON_PORT=28960
+
+[Install]
+WantedBy=multi-user.target