Add Docker support and installation guide for easy server deployment

Includes a Dockerfile for building the application image and an INSTALLATION.md file detailing the setup process, prerequisites, and helpful commands for managing the application on a private server.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ae4037a0-2a6f-4530-9bac-79b543286bda
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
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docker-compose.yml

@@ -0,0 +1,48 @@
+version: '3.8'
+
+services:
+  # Base de données PostgreSQL
+  postgres:
+    image: postgres:16-alpine
+    container_name: socialflow-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: ${PGDATABASE:-socialflow}
+      POSTGRES_USER: ${PGUSER:-socialflow}
+      POSTGRES_PASSWORD: ${PGPASSWORD:-changeme}
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    ports:
+      - "${PGPORT:-5432}:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${PGUSER:-socialflow}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  # Application Social Flow
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: socialflow-app
+    restart: unless-stopped
+    ports:
+      - "${PORT:-5000}:5000"
+    environment:
+      NODE_ENV: production
+      PORT: 5000
+      DATABASE_URL: postgresql://${PGUSER:-socialflow}:${PGPASSWORD:-changeme}@postgres:5432/${PGDATABASE:-socialflow}
+      OPENROUTER_API_KEY: ${OPENROUTER_API_KEY}
+      SESSION_SECRET: ${SESSION_SECRET:-your-secret-key-change-me}
+      APP_URL: ${APP_URL:-http://localhost:5000}
+    volumes:
+      - ./uploads:/app/uploads
+    depends_on:
+      postgres:
+        condition: service_healthy
+    command: sh -c "npm run db:push && node dist/server.js"
+
+volumes:
+  postgres_data:
+    driver: local