feat: add ZAI provider via OpenAI-compatible base_url; enable --api-type zai; update env example and docs

[codegen-sh]

Summary

• Add a dedicated zai provider to configs/oai_config.py using OpenAIWrapper with base_url override
• Insert zai into DEFAULT_PROVIDER_PRIORITY (after openai)
• Expose --api-type zai in configs/mode_config.py
• Add ZAI env placeholders to configs/env.example
• Minimal usage notes in README.md and USAGE.md

How it works

• The ZAI provider reuses the existing OpenAI-compatible pathway (autogen OpenAIWrapper) by reading ZAI_API_KEY, ZAI_MODEL, and ZAI_BASE_URL
• You can select it via DEFAULT_API_PROVIDER=zai or --api-type zai
• Alternatively, keep api_type=openai and set OPENAI_BASE_URL to your Z proxy for zero-code-change usage

Validation

• Imported configs/oai_config.py locally to ensure syntax correctness
• Verified CLI --api-type zai appears in help and flows into get_llm_config
• Repo setup remains backward-compatible; no breaking changes

Setup notes

• Add to configs/.env (do not commit secrets):
  • ZAI_API_KEY=[REDACTED]
  • ZAI_MODEL=glm-4.5 (or your proxy’s model name)
  • ZAI_BASE_URL=https://<your-z-proxy>/v1
• Ensure SERPER_API_KEY and JINA_API_KEY are present for deep search functionality

Next steps (optional)

• If desired, I can add a small smoke test that constructs the OpenAIWrapper with --api-type zai and performs a no-op call behind a --skip-config-check toggle.

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💻 View my work • 👤 Initiated by @Zeeeepa • About Codegen
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Summary by cubic

Adds a ZAI provider using the OpenAI-compatible path via base_url. Select it with --api-type zai or DEFAULT_API_PROVIDER=zai; env templates and docs include quick setup.

• New Features
  • Adds 'zai' provider (OpenAI-compatible) reading ZAI_API_KEY, ZAI_MODEL, ZAI_BASE_URL.
  • Places 'zai' after 'openai' in DEFAULT_PROVIDER_PRIORITY and exposes --api-type zai.
  • Updates configs/env.example, README.md, and USAGE.md with setup and the OPENAI_BASE_URL proxy option.

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