feat(models): add GLM (Zhipu AI) adaptation with dedicated provider and formatters (#2316)

### Background
GLM (Zhipu AI) exposes an OpenAI-compatible Chat Completions endpoint,
but previously users had to manually configure `baseUrl`, pick the right
formatter from the `formatter` package, and there was no `ModelRegistry`
support (no `glm:<model>` string id). The existing `GLMFormatter` also
lagged behind the current Zhipu API (glm-5.2 / glm-4.7 era): several
OpenAI-style parameters are rejected or silently ignored by the GLM
endpoint.