Remove the tts-service-api git submodule and all custom setup.py build
machinery (BuildPackageProtos, BuildPyGRPC, DevelopGRPC, CustomInstall,
CustomEggInfo). gRPC stubs are now provided by the tts-api package.

Changes:
- setup.py: remove all proto-generation commands; add tts-api to
  install_requires (git ref until PyPI publish); fix doc URL to tts-api
- pyproject.toml: remove grpcio-tools build dependency
- setup.sh: remove submodule init (pre-commit only)
- install.sh: remove proto sentinel check
- tox.ini: switch skip_install=false + extras=test; remove manual
  grpcio/protobuf deps; remove commands_pre stub check
- .github/workflows/test.yml: remove submodules checkout and build_grpc step
- .gitmodules: deleted (no submodule)
- tts_client_python/proto/__init__.py: deleted
- 5 import sites updated: from tts_client_python.proto → from techmo.tts.api.v3
- CLAUDE.md: update proto stubs, setup, CI and dependency sections

feat: replace local proto generation with tts-api package dependency

chore: bump version 3.2.8+1 → 3.2.9; fix placeholder versions in docs

* fix: use dpkg-query for libportaudio detection in install.sh

ldconfig -p reads a pre-built cache that may be stale after package
install, causing false "not found" warnings. Replace with dpkg-query
as the primary check (authoritative on Debian/Ubuntu), falling back
to ldconfig -p on non-Debian systems.

* chore: bump version 3.2.9 → 3.2.10; update changelog

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Co-authored-by: YASoftwareDev <[email protected]>