Camera specific GenAI provider

[phabibjr]

Describe what you are trying to accomplish and why in non-technical terms
I want to assign different generative AI (GenAI) providers to each camera. For instance, I would like to use OpenAI for outdoor cameras and a local provider, such as Ollama, for indoor cameras. This approach protects privacy for indoor cameras while reducing the workload on Ollama by offloading outdoor cameras to OpenAI.

Describe the solution you'd like
Allow each camera to have its GenAI provider configured individually in its settings. The system should use the specified provider for that camera when generating or regenerating descriptions.

Describe alternatives you've considered
Instead of configuring providers per camera, enable settings to assign GenAI providers for groups of cameras, such as indoor and outdoor groups.

Additional context
In version 0.15rc1, I tried setting Ollama as the GenAI provider for a single camera without a global provider configured. However, when clicking "regenerate," the popup indicated that the request was sent to OpenAI, and no new description was generated.