fix(backends): repair release CI build/test breaks (kokoros, fish-speech, llama-cpp-quantization, sglang) (#10547)

* fix(kokoros): implement new Backend RPCs to fix the build

The backend.proto grew six RPCs (SoundDetection, Depth, TokenClassify,
Score and the bidi-streaming Forward) that the kokoros gRPC service never
implemented, so the trait impl no longer satisfies `Backend`:

    error[E0046]: not all trait items implemented, missing:
      `sound_detection`, `depth`, `token_classify`, `score`,
      `ForwardStream`, `forward`

kokoros is a TTS backend with no use for these, so add `unimplemented`
stubs (plus the `ForwardStream` associated type) matching the existing
pattern for every other unsupported RPC in this file.

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Assisted-by: Claude:claude-opus-4-8 [Claude Code]

* fix(fish-speech): add setuptools-rust for the editable source install

install.sh installs the fish-speech source tree editable with
`--no-build-isolation`, which means the build backends of its transitive
dependencies must already be present in the venv. One of them builds a
Rust extension and its metadata step fails with:

    ModuleNotFoundError: No module named 'setuptools_rust'

Add setuptools-rust to requirements.txt so installRequirements provisions
it before the editable install runs.

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Assisted-by: Claude:claude-opus-4-8 [Claude Code]

* fix(llama-cpp-quantization): vendor convert_hf_to_gguf.py with conversion/

Upstream llama.cpp split the model-specific logic out of the single
convert_hf_to_gguf.py file into a sibling `conversion/` package, so the
script now starts with `from conversion import ...`. Downloading just the
one file therefore fails at runtime with:

    ModuleNotFoundError: No module named 'conversion'

Clone the repo (reusing the clone already needed to build llama-quantize)
and copy both the script and the `conversion/` package into the backend
dir. Python puts the script's own directory on sys.path[0], so the package
resolves when it sits beside the script.

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Assisted-by: Claude:claude-opus-4-8 [Claude Code]

* fix(sglang): pin the CPU source build to sglang v0.5.11

The CPU profile builds sgl-kernel from a `git clone` of sglang with no
ref, so it always tracks master. Recent master added CPU kernels (e.g.
mamba/fla.cpp) that fail to compile in our builder:

    constexpr variable 'scale' must be initialized by a constant
    static library kineto_LIBRARY-NOTFOUND not found

Pin the clone to v0.5.11, the same release the GPU path already floors on
(requirements-cublas12-after.txt). Overridable via SGLANG_VERSION so the
pin can be bumped deliberately.

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Assisted-by: Claude:claude-opus-4-8 [Claude Code]

---------

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Co-authored-by: Ettore Di Giacinto <mudler@localai.io>

backend/python/sglang/install.sh

@@ -85,9 +85,15 @@ if [ "x${BUILD_TYPE}" == "x" ] || [ "x${FROM_SOURCE:-}" == "xtrue" ]; then
     # The resulting binary still requires an AVX-512 capable CPU at runtime,
     # same constraint sglang upstream documents in docker/xeon.Dockerfile.
 
+    # Pin the source build to the same release the GPU path floors on
+    # (0.5.11, see requirements-cublas12-after.txt). An unpinned master clone
+    # pulls in newer CPU kernels (e.g. mamba/fla.cpp) that fail to compile
+    # (constexpr non-constant + kineto_LIBRARY-NOTFOUND). Bump deliberately.
+    SGLANG_VERSION="${SGLANG_VERSION:-v0.5.11}"
     _sgl_src=$(mktemp -d)
     trap 'rm -rf "${_sgl_src}"' EXIT
-    git clone --depth 1 https://github.com/sgl-project/sglang "${_sgl_src}/sglang"
+    git clone --depth 1 --branch "${SGLANG_VERSION}" \
+        https://github.com/sgl-project/sglang "${_sgl_src}/sglang"
 
     # Patch -march=native → -march=sapphirerapids in the CPU kernel CMakeLists
     sed -i 's/-march=native/-march=sapphirerapids/g' \