ui: Restructure repo to use tools/ui folder and ui / UI / llama-ui / LLAMA_UI naming (#23064)

* webui: Move static build output from `tools/server/public` to `build/ui` directory

* refactor: Move to `tools/ui`

* refactor: rename CMake variables and preprocessor defines

- Rename LLAMA_BUILD_WEBUI -> LLAMA_BUILD_UI (old kept as deprecated)
- Rename LLAMA_USE_PREBUILT_WEBUI -> LLAMA_USE_PREBUILT_UI (old kept as deprecated)
- Backward compat: old vars auto-forward to new ones with DEPRECATION warning
- Rename internal vars: WEBUI_SOURCE -> UI_SOURCE, WEBUI_SOURCE_DIR -> UI_SOURCE_DIR, etc.
- Rename HF bucket: LLAMA_WEBUI_HF_BUCKET -> LLAMA_UI_HF_BUCKET
- Emit both LLAMA_BUILD_WEBUI and LLAMA_BUILD_UI preprocessor defines
- Emit both LLAMA_WEBUI_DEFAULT_ENABLED and LLAMA_UI_DEFAULT_ENABLED

* refactor: rename CLI flags (--webui -> --ui) with backward compat

- Add --ui/--no-ui (old --webui/--no-webui kept as deprecated aliases)
- Add --ui-config (old --webui-config kept as deprecated alias)
- Add --ui-config-file (old --webui-config-file kept as deprecated alias)
- Add --ui-mcp-proxy/--no-ui-mcp-proxy (old --webui-mcp-proxy kept as deprecated)
- Add new env vars: LLAMA_ARG_UI, LLAMA_ARG_UI_CONFIG, LLAMA_ARG_UI_CONFIG_FILE, LLAMA_ARG_UI_MCP_PROXY
- C++ struct fields: params.ui, params.ui_config_json, params.ui_mcp_proxy added alongside old fields
- Backward compat: old fields synced to new ones in g_params_to_internals

* refactor: update C++ server internals with backward compat

- Rename json_webui_settings -> json_ui_settings (both kept in server_context_meta)
- Rename params.webui usage -> params.ui (both synced, old still works)
- JSON API emits both "ui"/"ui_settings" and "webui"/"webui_settings" keys
- Server routes use params.ui_mcp_proxy || params.webui_mcp_proxy
- Preprocessor guards use #if defined(LLAMA_BUILD_UI) || defined(LLAMA_BUILD_WEBUI)

* refactor: rename CI/CD workflows, artifacts, and build script

- Rename webui-build.yml -> ui-build.yml; artifact webui-build -> ui-build
- Rename webui-publish.yml -> ui-publish.yml; var HF_BUCKET_WEBUI_STATIC_OUTPUT -> HF_BUCKET_UI_STATIC_OUTPUT
- Rename server-webui.yml -> server-ui.yml; job webui-build/checks -> ui-build/checks
- Update server.yml: job/artifact refs webui-build -> ui-build
- Update release.yml: all webui-build/publish refs -> ui-build/publish; HF_TOKEN_WEBUI_STATIC_OUTPUT -> HF_TOKEN_UI_STATIC_OUTPUT
- Update server-self-hosted.yml: webui-build -> ui-build
- Update build-self-hosted.yml: HF_WEBUI_VERSION -> HF_UI_VERSION
- Rename webui-download.cmake -> ui-download.cmake (internal refs updated)
- Update labeler.yml: server/webui -> server/ui path label

* docs: update CODEOWNERS and server README docs

- Update CODEOWNERS: team ggml-org/llama-webui -> ggml-org/llama-ui, path /tools/server/webui/ -> /tools/ui/
- Update server README.md: CLI tables show --ui flags with deprecated --webui aliases
- Update server README-dev.md: "WebUI" -> "UI", paths updated to tools/ui/

* fix: Small fixes for UI build

* fix: CMake.txt syntax

* chore: Formatting

* fix: `.editorconfig` for llama-ui

* chore: Formatting

* refactor: Use `APP_NAME` in Error route

* refactor: Cleanup

* refactor: Single migration service

* make llama-ui a linkable target

* fix: UI Build output

* fix: Missing change

* fix: separate llama-ui npm build output into build/tools/ui/dist subfolder + use cmake npm build instead of downloading ui-build.yml artifacts in CI

* refactor: UI workflows cleanup

---------

Co-authored-by: Xuan Son Nguyen <son@huggingface.co>

tools/ui/static/favicon.svg

@@ -0,0 +1 @@
+<svg width="256" xmlns="http://www.w3.org/2000/svg" height="256" id="screenshot-ef94fbb0-dbab-80ed-8006-89429900edbf" viewBox="0 0 256 256" xmlns:xlink="http://www.w3.org/1999/xlink" fill="none" version="1.1"><g id="shape-ef94fbb0-dbab-80ed-8006-89429900edbf" rx="0" ry="0"><g id="shape-ef94fbb0-dbab-80ed-8006-894215755c3a"><g class="fills" id="fills-ef94fbb0-dbab-80ed-8006-894215755c3a"><rect rx="0" ry="0" x="0" y="0" transform="matrix(1.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000)" width="256" height="256" style="fill: rgb(27, 31, 32); fill-opacity: 1;"/></g></g><g id="shape-ef94fbb0-dbab-80ed-8006-89422363ef3f" rx="0" ry="0"><g id="shape-ef94fbb0-dbab-80ed-8006-89422363ef40"><g class="fills" id="fills-ef94fbb0-dbab-80ed-8006-89422363ef40"><path d="M171.66500854492188,99.5302505493164L159.79953002929688,120.62468719482422C144.15451049804688,108.58329010009766,120.9504165649414,106.8254165649414,105.3053970336914,119.7457504272461C80.0798110961914,140.57652282714844,81.8376235961914,188.7422637939453,121.1261978149414,189.00587463378906C132.11300659179688,189.00587463378906,141.42965698242188,183.8201141357422,151.44967651367188,180.39234924316406L156.72335815429688,201.3988494873047C147.84591674804688,205.52989196777344,138.79293823242188,209.7487335205078,129.03683471679688,211.06712341308594C40.08835220336914,223.1964569091797,45.18600845336914,94.78400421142578,125.6088638305664,88.10407257080078C142.48434448242188,86.69782257080078,157.33834838867188,91.09247589111328,171.75314331054688,99.5302505493164Z" class="st0" style="fill: rgb(255, 130, 54); fill-opacity: 1;"/></g></g><g id="shape-ef94fbb0-dbab-80ed-8006-89422363ef41"><g class="fills" id="fills-ef94fbb0-dbab-80ed-8006-89422363ef41"><path d="M110.2272720336914,79.31470489501953C96.6918716430664,83.35785675048828,84.1232681274414,90.8288345336914,74.6305923461914,101.28812408447266C72.8727798461914,80.01782989501953,77.6188735961914,37.03793716430664,101.2621841430664,28.6001033782959C104.7780532836914,27.36964988708496,116.8195571899414,24.293371200561523,116.4679946899414,30.533788681030273C116.1161880493164,36.77426528930664,107.7663345336914,47.49722671508789,105.7450942993164,53.29823684692383C102.2292251586914,63.49386978149414,105.4811782836914,70.52535247802734,110.3154067993164,79.40265655517578Z" class="st0" style="fill: rgb(255, 130, 54); fill-opacity: 1;"/></g></g><g id="shape-ef94fbb0-dbab-80ed-8006-89422363ef42"><g class="fills" id="fills-ef94fbb0-dbab-80ed-8006-89422363ef42"><path d="M143.62692260742188,127.65621185302734L143.62692260742188,143.47706604003906L157.68991088867188,143.47706604003906L157.68991088867188,155.7821807861328L143.62692260742188,155.7821807861328L143.62692260742188,170.7240753173828L130.44284057617188,170.7240753173828L130.44284057617188,155.7821807861328L115.5009536743164,155.7821807861328L115.5009536743164,143.47706604003906L129.12448120117188,143.47706604003906L130.44284057617188,142.15867614746094L130.44284057617188,127.65621185302734L143.62692260742188,127.65621185302734Z" class="st0" style="fill: rgb(255, 130, 54); fill-opacity: 1;"/></g></g><g id="shape-ef94fbb0-dbab-80ed-8006-89422363ef43"><g class="fills" id="fills-ef94fbb0-dbab-80ed-8006-89422363ef43"><path d="M191.96823120117188,127.65621185302734L191.96823120117188,142.15867614746094L193.28683471679688,143.47706604003906L206.91036987304688,143.47706604003906L206.91036987304688,155.7821807861328L191.96823120117188,155.7821807861328L191.96823120117188,170.7240753173828L178.78439331054688,170.7240753173828L178.78439331054688,155.7821807861328L164.72140502929688,155.7821807861328L164.72140502929688,143.47706604003906L178.78439331054688,143.47706604003906L178.78439331054688,127.65621185302734L191.96823120117188,127.65621185302734Z" class="st0" style="fill: rgb(255, 130, 54); fill-opacity: 1;"/></g></g><g id="shape-ef94fbb0-dbab-80ed-8006-89422363ef44"><g class="fills" id="fills-ef94fbb0-dbab-80ed-8006-89422363ef44"><path d="M153.20748901367188,38.092655181884766C154.96554565429688,40.72946548461914,145.03341674804688,52.06770706176758,143.45114135742188,54.96817398071289C138.88082885742188,63.581790924072266,141.95700073242188,68.50382232666016,145.38473510742188,76.67792510986328C135.45285034179688,75.18372344970703,126.2240982055664,76.41425323486328,116.3798599243164,77.55683135986328C118.5773696899414,58.659732818603516,129.21261596679688,31.1490535736084,153.20748901367188,38.092655181884766Z" class="st0" style="fill: rgb(255, 130, 54); fill-opacity: 1;"/></g></g></g></g></svg>

tools/ui/static/loading.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <meta http-equiv="refresh" content="5">
+    </head>
+    <body>
+        <div id="loading">
+            The model is loading. Please wait.<br/>
+            The user interface will appear soon.
+        </div>
+    </body>
+</html>