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Add three new Chinese LLM providers with OAuth PKCE sign-in:
- GLM (Zhipu AI) — OAuth PKCE via open.bigmodel.cn, access token for chat completions API
- Spark (iFlytek) — OAuth PKCE via spark-api.xf-yun.com, OpenAI-compatible chat completions
- ERNIE (Baidu) — OAuth PKCE via openapi.baidu.com, access token as URL param for WenxinWorkshop API
All three use env-driven credentials (GLM_CLIENT_ID/SECRET, SPARK_CLIENT_ID/SECRET, ERNIE_CLIENT_ID/SECRET).