fix quality checks

[SISUinSea]

What changed

• Fixed the RESP parser input typing so mypy app accepts the actual buffered stream used by the TCP server.
• Added a small protocol-based stream interface in the RESP parser instead of relying on the narrower BinaryIO type.
• Applied Ruff formatting to the files that were failing ruff format --check ..

Why

• Quality checks were failing for two separate reasons: one real type mismatch in the RESP parsing path, and a few files that were only out of format.
• The type error came from app/protocol/resp_server.py passing self.rfile into parse_command_frame(...) while the parser signature required BinaryIO, which was stricter than the stream object provided by socketserver.

Tests

• automated:
  • ./.venv/bin/ruff check .
  • ./.venv/bin/ruff format --check .
  • ./.venv/bin/mypy app
• manual smoke:
  • Not run for this change. This PR only fixes static quality checks and formatting.

Docs updated

• No docs updated.
• This change does not alter the documented HTTP or RESP contracts.

Known limitations

• No behavioral changes were made beyond fixing the static typing contract for the RESP parser input.
• PR was prepared from codex/fix/quality-check and should target chore/dev.