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/server/server-http.cpp

@@ -1,6 +1,7 @@
 #include "common.h"
 #include "server-http.h"
 #include "server-common.h"
+#include "ui.h"
 
 #include <cpp-httplib/httplib.h>
 
@@ -10,14 +11,6 @@
 #include <string>
 #include <thread>
 
-#ifdef LLAMA_BUILD_WEBUI
-// auto generated files (see README.md for details)
-#include "index.html.hpp"
-#include "bundle.js.hpp"
-#include "bundle.css.hpp"
-#include "loading.html.hpp"
-#endif
-
 //
 // HTTP implementation using cpp-httplib
 //
@@ -238,10 +231,11 @@ bool server_http_context::init(const common_params & params) {
     };
 
     auto middleware_server_state = [this](const httplib::Request & req, httplib::Response & res) {
-        (void)req; // suppress unused parameter warning when LLAMA_BUILD_WEBUI is not defined
+        (void)req; // suppress unused parameter warning when LLAMA_BUILD_UI / LLAMA_BUILD_WEBUI is not defined
         bool ready = is_ready.load();
         if (!ready) {
-#ifdef LLAMA_BUILD_WEBUI
+// Support both old and new preprocessor defines
+#if defined(LLAMA_BUILD_UI) || defined(LLAMA_BUILD_WEBUI)
             auto tmp = string_split<std::string>(req.path, '.');
             if (req.path == "/" || (tmp.size() > 0 && tmp.back() == "html")) {
                 res.status = 503;
@@ -305,8 +299,10 @@ bool server_http_context::init(const common_params & params) {
     // Web UI setup
     //
 
-    if (!params.webui) {
-        SRV_INF("%s", "the WebUI is disabled\n");
+    // Use new `params.ui` field (backed by old `params.webui` for compat)
+    if (!params.ui) {
+        SRV_INF("%s", "The UI is disabled\n");
+        SRV_INF("%s", "Use --ui/--no-ui (or deprecated --webui/--no-webui) to enable/disable\n");
     } else {
         // register static assets routes
         if (!params.public_path.empty()) {
@@ -317,7 +313,8 @@ bool server_http_context::init(const common_params & params) {
                 return 1;
             }
         } else {
-#ifdef LLAMA_BUILD_WEBUI
+// Support both old and new preprocessor defines
+#if defined(LLAMA_BUILD_UI) || defined(LLAMA_BUILD_WEBUI)
             // using embedded static index.html
             srv->Get(params.api_prefix + "/", [](const httplib::Request & /*req*/, httplib::Response & res) {
                 // COEP and COOP headers, required by pyodide (python interpreter)