Enable connection to an external PostgreSQL database for greater flexibility

Refactors Docker configuration to support external PostgreSQL database connections, updating .env, README, docker-compose, and entrypoint script.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 91318273-c764-4fd4-be04-bdc12c38af32
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/6e755801-08e8-4492-805e-ac3610de5a2a.jpg

docker-compose.yml

@@ -1,37 +1,14 @@
 version: '3.8'
 
 services:
-  # Base de données PostgreSQL
-  postgres:
-    image: postgres:15-alpine
-    container_name: regisflow-db
-    environment:
-      POSTGRES_DB: regisflow
-      POSTGRES_USER: regisflow
-      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-regisflow2024}
-    volumes:
-      - postgres_data:/var/lib/postgresql/data
-      - ./init.sql:/docker-entrypoint-initdb.d/init.sql:ro
-    ports:
-      - "5433:5432"
-    restart: unless-stopped
-    healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U regisflow -d regisflow"]
-      interval: 10s
-      timeout: 5s
-      retries: 5
-
-  # Application RegisFlow
+  # Application RegisFlow seule (base de données externe)
   regisflow:
     build: .
     container_name: regisflow-app
-    depends_on:
-      postgres:
-        condition: service_healthy
     environment:
       NODE_ENV: production
       PORT: 5000
-      DATABASE_URL: postgresql://regisflow:${POSTGRES_PASSWORD:-regisflow2024}@postgres:5432/regisflow
+      DATABASE_URL: ${DATABASE_URL}
       SESSION_SECRET: ${SESSION_SECRET:-your-super-secret-session-key-change-in-production}
       TZ: Europe/Paris
     volumes:
@@ -46,10 +23,6 @@ services:
       retries: 3
       start_period: 60s
 
-
-
 volumes:
-  postgres_data:
-    driver: local
   backup_data:
     driver: local