add docker specifics

.env.example

@@ -50,6 +50,34 @@ PASSWORD=change-this-default-admin-password
 
 # 4. NEVER commit actual secrets to version control!
 
+# =============================================================================
+# PLATFORM SELECTION
+# =============================================================================
+
+# Platform mode: "windows" (default) or "docker"
+# PLATFORM=windows
+
+# =============================================================================
+# DOCKER MODE SETTINGS (required when PLATFORM=docker)
+# =============================================================================
+
+# Docker image name for ACC server containers (built from docker/acc-server/Dockerfile)
+# ACC_IMAGE=acc-wine:latest
+
+# Host-side path for the shared ACC game installation volume.
+# IMPORTANT: must be the HOST path — ACC containers are Docker siblings of the manager.
+# ACC_GAME_VOLUME=/data/acc-game
+
+# Host-side base path for per-server config directories.
+# ACC_CONFIG_BASE_PATH=/data/configs
+
+# Port pool for Docker-mode ACC server containers (one port per server).
+# PORT_POOL_MIN=9600
+# PORT_POOL_MAX=9700
+
+# Linux SteamCMD binary path (pre-installed in the manager Docker image).
+# STEAMCMD_LINUX_PATH=/usr/games/steamcmd
+
 # =============================================================================
 # OPTIONAL SETTINGS (These are handled by system config in database)
 # =============================================================================