Nitro V3 update: CLI-only (Linux), settings via .env

- Moved Nitro V3 update from web UI (Commandocentrum) to CLI-only
- Removed configure paths form and runUpdateNitrov3() from admin panel
- update-Nitrov3.sh now loads .env automatically from its directory
- Added all NITRO_* env vars to .env.example.linux and .env
- Removed configurable paths from database (replaced by .env)
- Updated README and CHANGELOG

.env.example.linux

@@ -70,6 +70,21 @@ RCON_PORT=3001
 EMULATOR_IP=127.0.0.1
 EMULATOR_PORT=3000
 
+# --- NITRO UPDATE (for update-Nitrov3.sh) ---
+NITRO_EMULATOR_PATH=/var/www/emulator
+NITRO_EMULATOR_SERVICE=emulator
+NITRO_DB_HOST=127.0.0.1
+NITRO_DB_PORT=3306
+NITRO_DB_NAME=habbo
+NITRO_DB_USER=root
+NITRO_DB_PASS=
+NITRO_SQL_DIR=/var/www/emulator/Database Updates
+NITRO_BACKUP_DIR=/var/www/emulator/Database Updates/backups
+NITRO_GAMEDATA_DIR=/var/www/Gamedata/config
+NITRO_CLIENT_DIR=/var/www/Nitro-V3/public/configuration
+NITRO_CLIENT_SRC=/var/www/Nitro-V3
+NITRO_RENDERER_SRC=/var/www/Nitro_Render_V3
+
 # --- CORS ---
 CORS_ALLOWED_ORIGINS=https://yourhotel.nl,https://www.yourhotel.nl,http://localhost:3000
 
@@ -78,9 +93,3 @@ APP_LOCALE=nl
 FORCE_HTTPS=true
 PASSWORD_RESET_TOKEN_TIME=15
 
-# --- NITRO PATHS ---
-NITRO_CLIENT_PATH=/var/www/Nitro-V3
-NITRO_RENDERER_PATH=/var/www/Nitro_Render_V3
-NITRO_BUILD_PATH=/var/www/Nitro-V3/dist
-NITRO_WEBROOT=/Client
-GAMEDATA_PATH=/var/www/Gamedata