chore(docker): add SQL Server and Adminer with docker-compose

.gitignore

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+# Node.js (backend)
+**/node_modules/
+**/dist/
+**/.env
+**/*.log
+
+# Local project context
+CLAUDE.md
+TODO.md
+CONTEXT.md
+.claude/
+
+# Flutter (frontend futur)
+**/build/
+**/.dart_tool/
+**/.flutter-plugins
+**/.flutter-plugins-dependencies
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+.DS_Store
+Thumbs.db

compose.yaml

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+services:
+  sqlserver:
+    image: mcr.microsoft.com/mssql/server:2022-latest
+    container_name: eme_sqlserver
+    environment:
+      ACCEPT_EULA: "Y"
+      MSSQL_SA_PASSWORD: ${MSSQL_SA_PASSWORD}
+      MSSQL_PID: "Developer"
+    ports:
+      - "1433:1433"
+    volumes:
+      - eme_sqlserver_data:/var/opt/mssql
+    networks:
+      - eme_network 
+      
+    restart: unless-stopped
+
+  adminer:
+    image: adminer:latest
+    container_name: eme_adminer
+    ports:
+      - "8081:8080"
+    networks:
+      - eme_network
+    restart: unless-stopped
+
+networks:
+  eme_network:
+    driver: bridge
+volumes:
+  eme_sqlserver_data: