docs: translate .env.example comments from Chinese to English

� Environment Configuration Localization:
- Translate all Chinese comments to English
- Maintain same configuration structure and values
- Update project references from TradingAgents-CN to TradingAgents
- Add enhanced usage instructions and quick start guide

� Key Changes:
- Header: TradingAgents Environment Variables Configuration Example
- API Keys: Clear English descriptions for all providers
- Database: English explanations for MongoDB and Redis configuration
- Reddit API: English comments for social media integration
- Usage Instructions: Comprehensive English setup guide

� Enhanced Documentation:
- Added Quick Start Guide section
- Separate instructions for minimal vs full feature setup
- Clear step-by-step configuration process
- Docker commands for database setup
- Dependency installation instructions

Now .env.example provides clear English guidance for:
- International users and developers
- API key configuration and sources
- Database setup (optional)
- Quick start vs full feature deployment
- Testing and validation steps

This makes the project more accessible to global users
while maintaining all functionality and configuration options.

.env.example

@@ -1,53 +1,53 @@
-# TradingAgents-CN 环境变量配置示例
-# 🔐 重要：复制此文件为 .env 并填入您的真实API密钥
-# ⚠️  警告：.env文件包含敏感信息，请勿提交到Git仓库
+# TradingAgents Environment Variables Configuration Example
+# 🔐 Important: Copy this file to .env and fill in your real API keys
+# ⚠️  Warning: .env file contains sensitive information, do not commit to Git repository
 
-# ===== 必需的API密钥 =====
+# ===== Required API Keys =====
 
-# 🇨🇳 阿里百炼 API 密钥 (推荐，国产大模型，中文优化)
-# 获取地址: https://dashscope.aliyun.com/
-# 注册阿里云账号 -> 开通百炼服务 -> 获取API密钥
-# 格式: sk-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+# 🇨🇳 DashScope (Alibaba Cloud) API Key (Recommended for Chinese users)
+# Get from: https://dashscope.aliyun.com/
+# Register Alibaba Cloud account -> Enable DashScope service -> Get API key
+# Format: sk-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
 DASHSCOPE_API_KEY=your_dashscope_api_key_here
 
-# 📊 FinnHub API 密钥 (必需，用于获取金融数据)
-# 获取地址: https://finnhub.io/
-# 免费账户每分钟60次请求，足够日常使用
-# 格式: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+# 📊 FinnHub API Key (Required for financial data)
+# Get from: https://finnhub.io/
+# Free account allows 60 requests per minute, sufficient for daily use
+# Format: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
 FINNHUB_API_KEY=your_finnhub_api_key_here
 
-# ===== 可选的API密钥 =====
+# ===== Optional API Keys =====
 
-# 🌍 OpenAI API 密钥 (可选，需要国外网络)
-# 获取地址: https://platform.openai.com/
-# 格式: sk-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+# 🌍 OpenAI API Key (Optional, requires international network access)
+# Get from: https://platform.openai.com/
+# Format: sk-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
 OPENAI_API_KEY=your_openai_api_key_here
 
-# 🔍 Google AI API 密钥 (可选，用于Gemini模型)
-# 获取地址: https://ai.google.dev/
+# 🔍 Google AI API Key (Optional, for Gemini models)
+# Get from: https://ai.google.dev/
 GOOGLE_API_KEY=your_google_api_key_here
 
-# 🤖 Anthropic API 密钥 (可选，用于Claude模型)
-# 获取地址: https://console.anthropic.com/
+# 🤖 Anthropic API Key (Optional, for Claude models)
+# Get from: https://console.anthropic.com/
 ANTHROPIC_API_KEY=your_anthropic_api_key_here
 
-# ===== 项目配置 =====
+# ===== Project Configuration =====
 
-# 结果存储目录
+# Results storage directory
 TRADINGAGENTS_RESULTS_DIR=./results
 
-# 日志级别 (DEBUG, INFO, WARNING, ERROR)
+# Log level (DEBUG, INFO, WARNING, ERROR)
 TRADINGAGENTS_LOG_LEVEL=INFO
 
-# ===== 数据库配置 =====
+# ===== Database Configuration =====
 
-# 🔧 数据库启用开关 (默认不启用，系统使用文件缓存)
-# 设置为 true 启用对应数据库，false 或不设置则禁用
+# 🔧 Database enable switches (Disabled by default, system uses file cache)
+# Set to true to enable corresponding database, false or unset to disable
 MONGODB_ENABLED=false
 REDIS_ENABLED=false
 
-# 🗄️ MongoDB数据库配置 (用于持久化存储股票数据和分析结果)
-# 使用Docker启动: scripts/start_services_alt_ports.bat
+# 🗄️ MongoDB database configuration (For persistent storage of stock data and analysis results)
+# Start with Docker: scripts/start_services_alt_ports.bat
 MONGODB_HOST=localhost
 MONGODB_PORT=27018
 MONGODB_USERNAME=admin
@@ -55,29 +55,44 @@ MONGODB_PASSWORD=tradingagents123
 MONGODB_DATABASE=tradingagents
 MONGODB_AUTH_SOURCE=admin
 
-# 📦 Redis缓存配置 (用于高速缓存和会话管理)
-# 使用Docker启动: scripts/start_services_alt_ports.bat
+# 📦 Redis cache configuration (For high-speed caching and session management)
+# Start with Docker: scripts/start_services_alt_ports.bat
 REDIS_HOST=localhost
 REDIS_PORT=6380
 REDIS_PASSWORD=tradingagents123
 REDIS_DB=0
 
-# ===== Reddit API 配置 (可选) =====
-# 用于获取社交媒体情绪数据
-# 获取地址: https://www.reddit.com/prefs/apps
+# ===== Reddit API Configuration (Optional) =====
+# For social media sentiment data collection
+# Get from: https://www.reddit.com/prefs/apps
 
-# Reddit 客户端ID
+# Reddit client ID
 REDDIT_CLIENT_ID=your_reddit_client_id
 
-# Reddit 客户端密钥
+# Reddit client secret
 REDDIT_CLIENT_SECRET=your_reddit_client_secret
 
-# Reddit 用户代理
-REDDIT_USER_AGENT=TradingAgents-CN/1.0
+# Reddit user agent
+REDDIT_USER_AGENT=TradingAgents/1.0
 
-# ===== 使用说明 =====
-# 1. 复制此文件为 .env: cp .env.example .env
-# 2. 编辑 .env 文件，填入您的真实API密钥
-# 3. 至少需要配置 DASHSCOPE_API_KEY 和 FINNHUB_API_KEY
-# 4. 运行 python -m cli.main config 检查配置状态
-# 5. 运行 python -m cli.main test 验证配置是否正确
+# ===== Usage Instructions =====
+# 1. Copy this file to .env: cp .env.example .env
+# 2. Edit .env file and fill in your real API keys
+# 3. At minimum, configure DASHSCOPE_API_KEY and FINNHUB_API_KEY
+# 4. Run python -m cli.main to start the application
+# 5. Test your configuration by running a sample analysis
+
+# ===== Quick Start Guide =====
+# For immediate use (minimal setup):
+# 1. Get DashScope API key from https://dashscope.aliyun.com/
+# 2. Get FinnHub API key from https://finnhub.io/
+# 3. Copy this file: cp .env.example .env
+# 4. Edit .env and set DASHSCOPE_API_KEY and FINNHUB_API_KEY
+# 5. Install dependencies: pip install pytdx beautifulsoup4
+# 6. Run: python -m cli.main
+
+# For full features (with database caching):
+# 1. Start databases: docker run -d -p 27017:27017 --name mongodb mongo
+# 2. Start Redis: docker run -d -p 6379:6379 --name redis redis
+# 3. Set MONGODB_ENABLED=true and REDIS_ENABLED=true in .env
+# 4. Run: python -m cli.main