Feat/backend english conversion 20260329

[anurag-ay]

Summary

This PR converts the remaining backend Chinese text to English across the report-generation and simulation pipeline.

The goal is to make generated content, prompts, API responses, logs, and runner output consistently English-first, while keeping compatibility where older Chinese-formatted data may still be parsed.

What Changed

• Translated the report generation stack to English
• Translated shared backend runtime/config/error messages to English
• Translated simulation API responses, preparation flow, runner logs, and CLI script output to English
• Translated ontology generation prompts and simulation/profile generation prompts to English
• Kept compatibility logic for older Chinese-formatted interview/output parsing, but converted visible literals to Unicode escapes where needed
• Removed visible Chinese literals from backend/ source files

Main Areas Updated

• Report generation:

  • backend/app/services/report_agent.py
  • backend/app/services/zep_tools.py
  • backend/app/api/report.py

• Simulation pipeline:

  • backend/app/api/simulation.py
  • backend/app/services/ontology_generator.py
  • backend/app/services/simulation_config_generator.py
  • backend/app/services/oasis_profile_generator.py
  • backend/app/services/simulation_runner.py

• Shared backend/runtime cleanup:

  • backend/app/__init__.py
  • backend/app/config.py
  • backend/app/services/graph_builder.py
  • backend/app/services/graph_provider/zep_cloud_provider.py
  • backend/app/services/simulation_ipc.py
  • backend/app/services/simulation_manager.py
  • backend/app/services/zep_entity_reader.py
  • backend/app/services/zep_graph_memory_updater.py
  • backend/app/utils/file_parser.py
  • backend/app/utils/llm_client.py
  • backend/app/utils/retry.py
  • backend/run.py

• Backend scripts:

  • backend/scripts/run_parallel_simulation.py
  • backend/scripts/run_reddit_simulation.py
  • backend/scripts/run_twitter_simulation.py
  • backend/scripts/test_profile_format.py

Verification

• rg -n --pcre2 "[\\p{Han}]" backend --glob '!backend/uv.lock' --glob '!backend/.venv/**' --glob '!backend/uploads/**'
  • no matches
• python3 -m py_compile ...
  • passed for the edited backend files

Notes

• This PR is primarily a language/prompt/output cleanup and is not intended to change core business logic.
• Existing saved reports/simulations generated before this change will still remain in their old language until regenerated.

[666ghj]

The project already has i18n support in place — please refer to [PR #428] for reference.