feat: add Docker configuration for deployment

.env.development

@@ -0,0 +1,14 @@
+# SimpleNote Web - Development Environment
+
+# Server
+PORT=3000
+NODE_ENV=development
+
+# Auth - generate with: node -e "console.log(require('crypto').randomBytes(32).toString('hex'))"
+ADMIN_TOKEN=dev-admin-token-change-in-production
+
+# Data
+DATA_ROOT=./data
+
+# CORS (comma-separated origins or * for all)
+CORS_ORIGIN=http://localhost:5173,http://localhost:3000