fix(omnivoice): drop -Wshadow to unblock LLAMA_FATAL_WARNINGS (CI 3rd-party)

[lalalune]

Summary

PR #18 unblocked the multi-line-comment failure in CI (3rd-party). The next layer of failure exposed under -DLLAMA_FATAL_WARNINGS=ON:

ggml-backend.h:427: 'ggml_backend_graph_copy' hides constructor for 'struct ggml_backend_graph_copy'
llama-arch.h:623:   declaration of 'arch' shadows a member of 'LLM_TN'
llama-adapter.h:60: declaration of 'a'/'b' shadows a member of 'llama_adapter_lora_weight'

All three are in upstream llama.cpp headers, but omnivoice_lib enabled -Wshadow on its own translation units which pulled in those headers, and -DLLAMA_FATAL_WARNINGS=ON escalated them to -Werror.

Drop -Wshadow from omnivoice_lib. Keep -Wall -Wextra -Wconversion (and the -Wno-* suppressions) so omnivoice's own code is still warning-checked. The omnivoice shared library and omnivoice-test-abi-c already don't enable -Wshadow.

Test plan

• CI (3rd-party) ubuntu-24-llguidance green
• Other CI lanes unaffected (omnivoice still compiles with -Wall/-Wextra)

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