chore: add good .env defaults

[nimarb]

Important

Adds default values to .env.template for Langfuse host and keys, improving local development setup.

• Environment Configuration:
  • Updated .env.template to set LANGFUSE_HOST=http://localhost:3000 as default.
  • Added example values for LANGFUSE_PUBLIC_KEY and LANGFUSE_SECRET_KEY.
  • Retained empty placeholders for optional E2E test API keys (e.g., OpenAI, SERPAPI).

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Greptile Summary

Disclaimer: Experimental PR review

Added default values to .env.template to improve local development setup experience, setting localhost defaults for Langfuse host and example keys.

• Modified .env.template to include LANGFUSE_HOST=localhost:3000 as default server URL
• Added example public/secret keys to demonstrate expected format
• Maintained empty placeholders for optional E2E test API keys (OpenAI, SERPAPI, etc.)

[greptile-apps]

LGTM

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