WebUI hide models in router mode

[crsawyer]

When using llama-server with presets in router mode add the ability to completely hide certain models from the WebUI.

Summary

Adding no-webui = true to a model's preset configuration will exclude it from the WebUI.

Why?

I tend to use the preset capability to load a group of models for offline vibe coding, but I don't want my embedding, reranking, and FIM models to be selectable via the WebUI. I also wanted it so that if there is only one available model after filtering, it would be automatically selected. I chose to reuse the no-webui argument for this. So that any model in the preset file that has no-webui = true will be excluded from the WebUI model selection list. This also means that the excluded models cannot be loaded or unloaded via the WebUI.

Example:

models.ini

[*]
ngl = 999
threads = -1

; chat, tools
[gpt-oss-120b]
hf = ggml-org/gpt-oss-120b-GGUF
load-on-startup = true
jinja = true
flash-attn = 1
ubatch-size = 2048
batch-size = 32768
parallel = 2
; ctx-size = 131072*params.n_parallel
ctx-size = 262144
temp = 1.0
;min-p = 0.0
min-p = 0.01
top-p = 1.0
top-k = 0.0
; --- Speculative
spec-type = ngram-mod
spec-ngram-size-n = 24
draft-min = 48
draft-max = 64

; FIM
[Qwen2.5-Coder-7B-Q8_0]
load-on-startup = true
hf = ggml-org/Qwen2.5-Coder-7B-Q8_0-GGUF:Q8_0
flash-attn = 1
ubatch-size = 1024
batch-size = 1024
ctx-size = 0
cache-reuse = 256
parallel = 2
; ctx-size = 32768*params.n_parallel
ctx-size = 65536
no-webui = true

; embedding
[Qwen3-Embedding-0.6B]
load-on-startup = true
hf = Qwen/Qwen3-Embedding-0.6B-GGUF:Q8_0
flash-attn = 1
embedding = true
pooling = last
ubatch-size = 8192
verbose-prompt = true
parallel = 2
; ctx-size = 8192*params.n_parallel
ctx-size = 16384
no-webui = true

; reranking
[Qwen3-Reranker-0.6B]
load-on-startup = true
hf = ggml-org/Qwen3-Reranker-0.6B-Q8_0-GGUF:Q8_0
flash-attn = 1
rerank = true
parallel = 2
; ctx-size = 4096*params.n_parallel
ctx-size = 8192
no-webui = true

And now run it:

llama-server --offline --log-colors on --log-prefix --log-timestamps --no-models-autoload --models-preset models.ini

Note: I haven't tested the ini file as written above. I pre-downloaded the models and use model = modelfile.gguf instead of the listed hf = org/model. Aside from that, this ini file was what I tested against.

[crsawyer]

Changes applied as requested

[allozaur]

@crsawyer please rebase this branch and rebuild the webui static output. then we're good to go