hoàn thành bước tạo docker compose

.env.example

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+# Copy this file to .env and fill in the values before running docker-compose.
+# NEVER commit .env to version control.
+
+# ── PostgreSQL ────────────────────────────────────────────────────────────────
+POSTGRES_DB=lms_db
+POSTGRES_USER=lms_user
+# REQUIRED — choose a strong password
+POSTGRES_PASSWORD=change_me_strong_password
+
+# ── JWT ───────────────────────────────────────────────────────────────────────
+# REQUIRED — generate with: python -c "import secrets; print(secrets.token_hex(32))"
+JWT_SECRET_KEY=change_me_generate_with_secrets_token_hex_32
+
+# Token lifetime in minutes (default: 60)
+ACCESS_TOKEN_EXPIRE_MINUTES=60
+
+# ── Ports ─────────────────────────────────────────────────────────────────────
+# Port exposed on the host for the Next.js frontend
+FRONTEND_PORT=3000