Update Alpha Vantage free tier documentation

[luohy15]

Clarify that the free API key is typically sufficient for TradingAgents thanks to Alpha Vantage's open-source support program, and only recommend premium upgrade if rate-limiting is encountered.

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello @luohy15, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the documentation in the README.md file to offer clearer guidance on using Alpha Vantage API keys. The update emphasizes that the free API tier is generally adequate for TradingAgents due to Alpha Vantage's open-source support, suggesting a premium upgrade only as a solution for actual rate-limiting problems.

Highlights

• Alpha Vantage Free Tier: Clarified that the free Alpha Vantage API key is typically sufficient for TradingAgents due to the provider's open-source support program.
• Premium Upgrade Recommendation: Updated the documentation to recommend upgrading to Alpha Vantage Premium only if users encounter rate-limiting issues.

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[gemini-code-assist]

Code Review

This pull request clarifies the usage of the free Alpha Vantage API key in the documentation, which is a helpful update for users. I've provided one suggestion to further improve the clarity and conciseness of the new text.