Feat/speech service - #25

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Commit 95a48e00814c4686a972c269adff6151604d47dd subject line exceeds 72 characters. Length: 75. Subject: 'refactor(speech): address PR review — codegen, model download, English docs'

Commit 57d07526c077390902846d52be9b6b10941a9393 subject line exceeds 72 characters. Length: 83. Subject: 'fix(speech): remove hardcoded local model path, use HuggingFace model ID as default'

Commit 16315ae1926f16562626e5ee5ea035dba75c4c19 subject line exceeds 72 characters. Length: 100. Subject: 'fix: restore slam.proto/prm_base.proto to dev state, keep only speech additions in robonix_msg.proto'