refactor: use $DOMAIN env var instead of hardcoded lazyworkhorse.net

Replace all hardcoded lazyworkhorse.net references in compose files
with ${DOMAIN} variable substitution. Create .env.production and
.env.staging environment files. Update Makefile with ENV selection
(--env-file support) and staging/production targets.

Changes:
- All 13 compose YAML files: lazyworkhorse.net -> ${DOMAIN}
- New .env.production (DOMAIN=lazyworkhorse.net)
- New .env.staging (DOMAIN=staging.lazyworkhorse.net)
- Makefile: ENV var, --env-file flag, staging/production targets
- Gitea redirect regex updated for variable substitution
- CI workflow checkout URLs left hardcoded (infrastructure refs)
- Dockerfile SSH host refs left hardcoded (infrastructure refs)

Deploy: make ENV=staging all_up  or  make staging
        make ENV=production all_up  or  make production

Makefile

@@ -1,13 +1,18 @@
 # Base path for docker-compose files
-COMPOSE_PATH=~/Projects/AltNet/docker-compose
+COMPOSE_PATH?=~/Projects/AltNet/docker-compose
+
+# Environment selection: staging or production (default)
+ENV?=production
+ENV_FILE=.env.$(ENV)
 
 # List of services (folder names)
 SERVICES=monitoring ai cloudstorage crm_tp crm_cf mediacenter homeautomation network backup homepage passwordmanager
 
 # Bring up all services
 all_up:
+	@echo "Deploying with $(ENV) environment ($(ENV_FILE))..."
 	@for service in $(SERVICES); do \
-		docker compose -f $(COMPOSE_PATH)/$$service/compose.yml up -d; \
+		docker compose --env-file $(ENV_FILE) -f $(COMPOSE_PATH)/$$service/compose.yml up -d; \
 	done
 
 # Bring down all services
@@ -18,15 +23,27 @@ all_down:
 
 # Generic target to deploy a specific service
 %_up:
-	@docker compose -f $(COMPOSE_PATH)/$*/compose.yml up -d
+	@echo "Deploying $* with $(ENV) environment ($(ENV_FILE))..."
+	@docker compose --env-file $(ENV_FILE) -f $(COMPOSE_PATH)/$*/compose.yml up -d
 
 # Generic target to bring down a specific service
 %_down:
 	@docker compose -f $(COMPOSE_PATH)/$*/compose.yml down
 
+# Deploy staging (all services)
+staging:
+	@$(MAKE) all_up ENV=staging
+
+# Deploy production (all services)
+production:
+	@$(MAKE) all_up ENV=production
+
+# Staging per-service: make openwebui_up ENV=staging
+# Production per-service: make openwebui_up ENV=production
+
 all_stack_up:
 	@for service in $(SERVICES); do \
-		docker stack deploy -c $(COMPOSE_PATH)/$$service/compose.yml $$service; \
+		docker stack deploy --env-file $(ENV_FILE) -c $(COMPOSE_PATH)/$$service/compose.yml $$service; \
 	done
 
 all_stack_down:
@@ -35,7 +52,7 @@ all_stack_down:
 	done
 
 %_stack_up:
-	@docker stack deploy -c $(COMPOSE_PATH)/$*/compose.yml $*
+	@docker stack deploy --env-file $(ENV_FILE) -c $(COMPOSE_PATH)/$*/compose.yml $*
 
 %_stack_down:
 	@docker stack rm $*
@@ -43,3 +60,9 @@ all_stack_down:
 stack_ls:
 	@docker node ps workGoat;
 	docker node ps workHorse
+
+# Show current environment settings
+env:
+	@echo "Active environment: $(ENV)"
+	@echo "Env file: $(ENV_FILE)"
+	@test -f $(ENV_FILE) && cat $(ENV_FILE) || echo "WARNING: $(ENV_FILE) not found!"