Remove MSSQL service from docker-compose

Update backend env to use external DB server (homelab.local)
and set new password

Drop the now‑unused depends_on, volume mount and default network
sections

Increment instance_id (3457 → 3463) for new system instance

db/data/.system/instance_id

@@ -1,3 +1,3 @@
 59629046-e974-4356-ba63-5f0605022367
 9979554600398963173
-3457
+3463

docker-compose.yml

@@ -1,33 +1,14 @@
 services:
-  mssql:
-    image: mcr.microsoft.com/mssql/server:2019-latest
-    container_name: mssql
-    environment:
-      - SA_PASSWORD=Passw0rd
-      - ACCEPT_EULA=Y
-    ports:
-      - "1433:1433"
-    volumes:
-      - ./db/data:/var/opt/mssql
-
   backend:
     build:
       context: ./backend
       dockerfile: Dockerfile
     container_name: backend
-    depends_on:
-      - mssql
     environment:
-      - DB_SERVER=mssql
+      - DB_SERVER=homelab.local
       - DB_USER=sa
-      - DB_PASSWORD=Passw0rd
+      - DB_PASSWORD=Ou812@12!@
       - DB_NAME=CustomerDB
     ports:
       - "8080:8080"
-    volumes:
-      - ./backend:/app
     command: ./main
-
-networks:
-  default:
-    driver: bridge