fix(makefile): improve generate-env command and script

- Fix bash error in generate_env.sh with proper environment variable handling
- Add docker-compose command detection for better compatibility
- Add generate-env-prod command with production warnings
- Make generate-env non-interactive by default for easier automation
- Add generate-env-interactive for when user input is needed
- Expand .env.example with more configuration options
- Add helpful production deployment warnings

Resolves: 'make generate-env generates nonsense' issue

.env.example

@@ -17,4 +17,18 @@ POSTGRES_USER=links_user
 POSTGRES_PASSWORD=links_password
 
 # Frontend настройки
-NEXT_PUBLIC_API_URL=http://localhost:8000
+NEXT_PUBLIC_API_URL=http://localhost:8000
+
+# Опциональные настройки
+# DJANGO_EMAIL_BACKEND=django.core.mail.backends.console.EmailBackend
+# DJANGO_EMAIL_HOST=
+# DJANGO_EMAIL_PORT=587
+# DJANGO_EMAIL_HOST_USER=
+# DJANGO_EMAIL_HOST_PASSWORD=
+# DJANGO_EMAIL_USE_TLS=True
+
+# Для продакшена
+# DJANGO_SECURE_SSL_REDIRECT=True
+# DJANGO_SECURE_HSTS_SECONDS=31536000
+# DJANGO_SECURE_HSTS_INCLUDE_SUBDOMAINS=True
+# DJANGO_SECURE_HSTS_PRELOAD=True