[AutoRL-Bench] Fix ALFWorld prompt exposure, update DeepSearchQA split, and translate tracked files to English

[couragec]

Summary

This PR updates AutoRL-Bench in three ways:

1. Stop exposing react_prompts.json to agents in ALFWorld.
2. Update DeepSearchQA to use the intended local split protocol.
3. Translate tracked AutoRL-Bench files and documentation into English for open-source readiness.

Changes

• ALFWorld

  • remove task-specific prompt exposure from the mounted workspace

• DeepSearchQA

  • switch to deterministic local split
  • update the default protocol to 100 train / 200 eval

• Documentation / open-source cleanup

  • translate tracked files under rdagent/scenarios/rl/autorl_bench
  • add bilingual README support

Notes

• This branch is based on the latest upstream/main.
• The PR keeps the existing fork-side AutoRL-Bench commits and merges in recent upstream updates.

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📚 Documentation preview 📚: https://RDAgent--1367.org.readthedocs.build/en/1367/