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With default of `False`.

* Add config variable RAG_EMBEDDING_MODEL_AUTO_UPDATE to control update behavior
* Add RAG utils embedding_model_get_path() function to output the filesystem path in addition to update of the model using huggingface_hub
* Update and utilize existing RAG functions in main: get_embedding_model() & update_embedding_model()
* Add GUI setting to execute manual update process

Generate manifest.json dynamically, using MANIFEST_NAME and
MANIFEST_SHORT_NAME from the environment.

This reverts commit 9763d885.

Add COMFYUI and WEBHOOK logging and associated environment variable
control. Add WEBHOOK payload & request debug logs.

This is very yolo code, use at your own risk

it can easily confuse people before becuase when people accidentally set `env.USER_PERMISSIONS_CHAT_DELETION` to `true/yes/Yes`, `USER_PERMISSIONS["chat"]["deletion"]` would become `False`, which is unexpectedly and hard to notice.

Allow Chat Deletion