server: enable jinja by default, update docs

[ngxson]

On server, we want to enable jinja by default to allow tool calling and default system prompts. More and more models require this, so I think it's finally time to make it enabled by default.

However, we don't want to enable this for other examples (like llama-cli or llama-run), because these examples cannot yet handle rolling back tokens. This can happen when the chat template wants to modify pass tokens, for example, one can delete the reasoning content from the formatted chat.

This PR also update the auto-generated docs via llama-gen-docs command

[CISC]

However, we don't want to enable this for other examples (like llama-cli or llama-run), because these examples cannot yet handle rolling back tokens. This can happen when the chat template wants to modify pass tokens, for example, one can delete the reasoning content from the formatted chat.

Supported in #16603 should probably make jinja default there as well.

[rankaiyx]

"disable jinja template for chat (default: enabled)"

Is there a mistake here?

[rankaiyx]

Hmm, that's a bit ambiguous.