Update speech server engine following change in controls handling

[JayPanoz]

This update covers readium/speech-server#31

Specifically, it handles the shifting from per-voice to provider-level controls.

[Copilot]

Pull request overview

Updates the Speech Server integration to account for speech-server moving controls from per-voice (GET /voices) to provider-level (GET /service), ensuring client-side rate handling reflects what the server actually honors.

Changes:

• Fetches /service alongside /voices and maps provider-level controls onto each returned ReadiumSpeechVoice.
• Updates SpeechServer TypeScript types and mapping utilities to remove per-voice controls and add provider controls to SpeechServerServiceInfo.
• Adjusts tests and bumps package version + changelog entry for the fix.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/SpeechServer/testUtils.ts	Updates test voice factory to stop emitting per-voice controls by default.
test/SpeechServer/speechServerEngineProvider.test.ts	Updates provider tests to supply /service provider-level controls and assert merged controls on voices.
test/SpeechServer/speechServerEngine.test.ts	Updates engine tests to model provider-level controls during background voice resolution.
src/SpeechServer/types.ts	Removes controls from SpeechServerVoice and adds controls (and optional quality) to service providers.
src/SpeechServer/speechServerVoiceMapping.ts	Changes mapping to accept provider controls and assign them to the mapped ReadiumSpeechVoice.
src/SpeechServer/speechServerEngineProvider.ts	Fetches /service in getVoices() and merges provider controls into each voice.
src/SpeechServer/speechServerEngine.ts	Fetches service info when loading voices and merges provider controls to avoid incorrect local rate fallback.
package.json	Bumps version to 0.7.1.
CHANGELOG.md	Documents the fix and the upstream API change.

Suppressed comments (1)

test/SpeechServer/speechServerEngine.test.ts:553

• These assertions/setVoice calls should use the documented ElevenLabs provider id segment (elevenlabs) in the URN, to match what the speech-server actually returns/accepts.

  engine.setVoice("urn:readium:tts:eleven:estelle"); // supersedes the still-pending lookup for "alba"
  await flush();

  t.is(engine.getCurrentVoice()?.identifier, "urn:readium:tts:eleven:estelle", "the later setVoice() call wins, not the earlier one's background resolution");

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