Support OpenAI-compatible API providers (e.g., Zhipu AI, DeepSeek, etc.)

Feature Request

Is your feature request related to a problem? Please describe.
The AI Agent feature currently only supports OpenAI as a provider. This limits users who cannot access OpenAI services
(e.g., users in China) or prefer to use other LLM providers that offer OpenAI-compatible APIs.

Describe the solution you'd like
Support OpenAI-compatible API providers by allowing custom baseURL configuration, similar to how Parse Server
handles AI adapters.

Currently, the code only accepts provider: 'openai':
[REDACTED]

Describe alternatives you've considered

• Using Parse Server cloud functions as a workaround
• Direct integration in frontend applications
• Using proxy services (not ideal for production)

Additional context
[REDACTED]
Many Chinese LLM providers offer OpenAI-compatible APIs.

All of these use the same request/response format as OpenAI, only the baseURL differs.

This would make Parse Dashboard more accessible to international users and those who prefer alternative LLM providers

The issue does not name files or tests. Start by locating the AI Agent configuration that currently accepts provider: 'openai' and trace how its requests are built; compare the intended configuration with Parse Server AI adapters. Done means an OpenAI-compatible provider can use a custom baseURL without changing the shared request/response format, with coverage for the new configuration.