ui: build-time gzip compression (#24571)

* ui: keep original file name and path

* fix nocache

* ui: build-time gzip compression

tools/ui/CMakeLists.txt

@@ -1,6 +1,7 @@
 set(TARGET llama-ui)
 
 set(LLAMA_UI_HF_BUCKET "ggml-org/llama-ui" CACHE STRING "Hugging Face bucket name for prebuilt UI assets")
+set(LLAMA_UI_GZIP      ON                  CACHE BOOL   "Apply gzip compress to assets to save bandwidth")
 
 # Backward compat: forward old var to new one
 if(DEFINED LLAMA_BUILD_WEBUI)
@@ -83,6 +84,7 @@ add_custom_target(llama-ui-assets ALL
         "-DHF_ENABLED=${LLAMA_USE_PREBUILT_UI}"
         "-DBUILD_UI=${LLAMA_BUILD_UI}"
         "-DLLAMA_UI_EMBED=${LLAMA_UI_EMBED_EXE}"
+        "-DLLAMA_UI_GZIP=${LLAMA_UI_GZIP}"
         -P "${PROJECT_SOURCE_DIR}/scripts/ui-assets.cmake"
     COMMENT "Provisioning UI assets"
     VERBATIM