Fix kokoros backend build break from Backend trait drift

[Copilot]

tests-kokoros started failing because the Rust kokoros backend no longer satisfied the generated Backend trait after AudioToAudioStream was added to the shared gRPC surface. The backend implementation was missing both the new associated stream type and RPC method.

• Root cause

  • backend/rust/kokoros/src/service.rs did not implement newly required trait items:
    • AudioToAudioStreamStream
    • audio_to_audio_stream(...)

• Change made

  • Added minimal, explicit UNIMPLEMENTED stubs in KokorosService to keep interface parity without changing kokoros runtime behavior.
  • Followed existing backend pattern for unsupported RPCs.

• Why this is minimal

  • No behavior change for supported kokoros features.
  • No proto or workflow edits; only trait conformance in the kokoros service implementation.

type AudioToAudioStreamStream = ReceiverStream<Result<backend::AudioToAudioResponse, Status>>;

async fn audio_to_audio_stream(
    &self,
    _: Request<tonic::Streaming<backend::AudioToAudioRequest>>,
) -> Result<Response<Self::AudioToAudioStreamStream>, Status> {
    Err(Status::unimplemented("Not supported"))
}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn.pyke.io
  • Triggering command: /home/REDACTED/work/LocalAI/LocalAI/backend/rust/kokoros/target/release/build/ort-sys-7d323129fad21ae4/build-script-main /home/REDACTED/work/LocalAI/LocalAI/backend/rust/kokoros/target/release/build/ort-sys-7d323129fad21ae4/build-script-main c-rendered-ansi,-f ctions -fdata-seconftest.er1 + ocal�� (dns block)
  • Triggering command: /home/REDACTED/work/LocalAI/LocalAI/backend/rust/kokoros/target/release/build/ort-sys-7d323129fad21ae4/build-script-main /home/REDACTED/work/LocalAI/LocalAI/backend/rust/kokoros/target/release/build/ort-sys-7d323129fad21ae4/build-script-main -o util.o /tmp/ccSMj8Xi.s 1.11/lame-3.100/include e \(.*(DEPDIR).*-I/home/REDACTED/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/mp3lame-sys-as 1.11/lame-3.100/libmp3lame /usr/bin/sed 1.11/lame-3.100/mpglib .2.2/opus/includ-W -1949cf8c6b5b557-I _FLP.c.o f/mp�� s/g f/mp3lame-sys-0.-I /bin/sh f/mp3lame-sys-0.sort .2.2/opus/silk /index.crates.io-I re_FLP.c.o (dns block)
  • Triggering command: /home/REDACTED/work/LocalAI/LocalAI/backend/rust/kokoros/target/release/build/ort-sys-7d323129fad21ae4/build-script-main /home/REDACTED/work/LocalAI/LocalAI/backend/rust/kokoros/target/release/build/ort-sys-7d323129fad21ae4/build-script-main --color= /kokoros/target/.libs/libmp3lame.lai ex.crates.io-194/tmp/ccDEFvUS.s f/mp�� io-1949cf8c6b5b557f/audiopus_sys-0.2.2/opus/silk f/mp3lame-sys-0.1.11/lame-3.100/libmp3lame u/13/cc1 f/mp3lame-sys-0.llvm-config .2.2/opus/includ--prefix /index.crates.io-1949cf8c6b5b557-I u/13/cc1 f/mp�� cc -DHAVE_CONFIG_H -I. -I/home//home/REDACTED/.cargo/registry/src/index.crates.io-1949cf8c6b5b557git f/mp3lame-sys-0.1.11/lame-3.100/libmp3lame rgo/bin/as f/mp3lame-sys-0./usr/bin/gmake e /index.crates.io-f ild (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)