Add comprehensive .gitignore

.env.example

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+# Backend API Configuration
+API_PORT=3000
+API_URL=http://localhost:3000
+NODE_ENV=development
+
+# Database Configuration
+DATABASE_HOST=localhost
+DATABASE_PORT=5432
+DATABASE_NAME=maternal_app
+DATABASE_USER=maternal_user
+DATABASE_PASSWORD=maternal_dev_password_2024
+
+# Redis Configuration
+REDIS_HOST=localhost
+REDIS_PORT=6379
+
+# MongoDB Configuration
+MONGODB_URI=mongodb://maternal_admin:maternal_mongo_password_2024@localhost:27017/maternal_ai_chat?authSource=admin
+
+# MinIO Configuration
+MINIO_ENDPOINT=localhost
+MINIO_PORT=9000
+MINIO_ACCESS_KEY=maternal_minio_admin
+MINIO_SECRET_KEY=maternal_minio_password_2024
+MINIO_BUCKET=maternal-files
+
+# JWT Configuration
+JWT_SECRET=your-super-secret-jwt-key-change-in-production
+JWT_EXPIRATION=1h
+JWT_REFRESH_SECRET=your-super-secret-refresh-key-change-in-production
+JWT_REFRESH_EXPIRATION=7d
+
+# AI Services Configuration (OpenAI)
+OPENAI_API_KEY=sk-your-openai-api-key-here
+OPENAI_MODEL=gpt-4-turbo-preview
+OPENAI_MAX_TOKENS=1000
+
+# AI Services Configuration (Anthropic Claude)
+ANTHROPIC_API_KEY=sk-ant-your-anthropic-api-key-here
+ANTHROPIC_MODEL=claude-3-sonnet-20240229
+
+# AI Services Configuration (Google Gemini)
+GOOGLE_AI_API_KEY=your-google-ai-api-key-here
+
+# Whisper API (Voice Recognition)
+WHISPER_API_KEY=your-whisper-api-key-here
+
+# Firebase Cloud Messaging
+FCM_SERVER_KEY=your-fcm-server-key-here
+FCM_SENDER_ID=your-fcm-sender-id-here
+
+# Rate Limiting
+RATE_LIMIT_TTL=60
+RATE_LIMIT_MAX=100
+
+# CORS Configuration
+CORS_ORIGIN=http://localhost:19000,exp://localhost:19000
+
+# Email Configuration (Optional - for email verification)
+SMTP_HOST=smtp.gmail.com
+SMTP_PORT=587
+SMTP_USER=your-email@gmail.com
+SMTP_PASSWORD=your-app-password
+
+# Sentry Error Tracking (Optional)
+SENTRY_DSN=your-sentry-dsn-here
+
+# Analytics (Optional)
+POSTHOG_API_KEY=your-posthog-api-key-here
+
+# App Configuration
+APP_NAME=Maternal App
+APP_VERSION=1.0.0