Update infrastructure to use external PostgreSQL server instead of Docker container. Modify .env.example and documentation to reflect new connection settings and deployment instructions.

docker-compose.yml

@@ -1,39 +1,14 @@
 services:
-  db:
-    image: postgres:17-alpine
-    environment:
-      POSTGRES_DB: ${POSTGRES_DB:-telewave}
-      POSTGRES_USER: ${POSTGRES_USER:-telewave}
-      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-telewave}
-    volumes:
-      - pgdata:/var/lib/postgresql/data
-    healthcheck:
-      test: ['CMD-SHELL', 'pg_isready -U ${POSTGRES_USER:-telewave} -d ${POSTGRES_DB:-telewave}']
-      interval: 5s
-      timeout: 5s
-      retries: 10
-    restart: unless-stopped
-    logging:
-      driver: json-file
-      options:
-        max-size: '10m'
-        max-file: '3'
-
   app:
     build:
       context: .
       dockerfile: Dockerfile
-    depends_on:
-      db:
-        condition: service_healthy
-    # Секреты (Jwt__SigningKey, AdminSeed__Password, ...) — из .env, см. .env.example.
-    # ConnectionStrings__Default ниже переопределяет .env: адрес БД внутри сети compose всегда 'db'.
+    # Postgres — внешний (не в compose), см. ConnectionStrings__Default в .env.
     env_file:
       - .env
     environment:
       ASPNETCORE_ENVIRONMENT: Production
       ASPNETCORE_HTTP_PORTS: '8085'
-      ConnectionStrings__Default: 'Host=db;Port=5432;Database=${POSTGRES_DB:-telewave};Username=${POSTGRES_USER:-telewave};Password=${POSTGRES_PASSWORD:-telewave}'
     healthcheck:
       test: ['CMD', 'curl', '-f', 'http://localhost:8085/health']
       interval: 15s
@@ -48,6 +23,3 @@ services:
       options:
         max-size: '10m'
         max-file: '3'
-
-volumes:
-  pgdata: