fix(deploy): DATABASE_URL aus POSTGRES_PASSWORD zusammenbauen

Kein doppeltes Passwort mehr in .env nötig.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

deploy/.env.example

@@ -2,7 +2,6 @@
 POSTGRES_PASSWORD=sicheres-passwort-hier
 
 # Backend
-MORZ_INFOBOARD_DATABASE_URL=postgres://morz_infoboard:sicheres-passwort-hier@db:5432/morz_infoboard?sslmode=disable
 MORZ_INFOBOARD_ADMIN_PASSWORD=
 MORZ_INFOBOARD_DEFAULT_TENANT=morz
 MORZ_INFOBOARD_MQTT_BROKER=tcp://mqtt:1883

deploy/docker-compose.yml

@@ -8,6 +8,7 @@ services:
       - .env
     environment:
       MORZ_INFOBOARD_HTTP_ADDR: ":8080"
+      MORZ_INFOBOARD_DATABASE_URL: "postgres://morz_infoboard:${POSTGRES_PASSWORD}@db:5432/morz_infoboard?sslmode=disable"
       MORZ_INFOBOARD_UPLOAD_DIR: /app/uploads
       MORZ_INFOBOARD_STATUS_STORE_PATH: /app/data/status
       MORZ_INFOBOARD_DEV_MODE: "false"