Add Python 3.14 Linux Bluetooth socket constants

[popsiclelmlm]

Summary

• Add the Python 3.14 Linux Bluetooth socket constants that were still missing from the stdlib socket stubs.
• Allow bare integer Bluetooth HCI device IDs in _socket._Address for Python 3.14+.
• Extend the Linux stubtest allowlist for Bluetooth constants that may be absent from CI/runtime builds without Bluetooth support.

Reproduction

• Bluetooth socket additions in Python 3.14 #15213 documents the Python 3.14 Linux runtime additions from a Debian Python 3.14.2 build, including BDADDR_*, BT_*, HCI_CHANNEL_*, L2CAP_*, and Bluetooth SOL_* constants.
• The same issue notes that BTPROTO_HCI accepts a bare integer device_id in Python 3.14.

Root cause

• The stubs already restored the base Bluetooth constants from restore bluetooth socket constants on Linux #15209, but the newer Python 3.14 Linux constants were not yet declared in _socket.pyi or re-exported from socket.pyi.
• Some Linux builds, including GitHub Actions runners, do not expose Bluetooth constants at runtime, so the allowlist needs to keep these entries optional.

Changes

• Add the missing Python 3.14 Linux Bluetooth constants to _socket.pyi.
• Re-export those constants from socket.pyi under the existing Python 3.14 Linux block.
• Widen _Address to include int only for Python 3.14+.
• Add optional Linux stubtest allowlist entries for the new Bluetooth constants.

Tests

• PATH=/tmp/typeshed-authlib-introspect-venv/bin:$PATH pre-commit run --files stdlib/_socket.pyi stdlib/socket.pyi stdlib/@tests/stubtest_allowlists/linux.txt
• PATH=/tmp/typeshed-authlib-introspect-venv/bin:$PATH /tmp/typeshed-authlib-introspect-venv/bin/python tests/pyright_test.py stdlib/_socket.pyi stdlib/socket.pyi --pythonversion 3.14
• PATH=/tmp/typeshed-authlib-introspect-venv/bin:$PATH /tmp/typeshed-authlib-introspect-venv/bin/python tests/mypy_test.py stdlib/_socket.pyi stdlib/socket.pyi --python-version 3.14 --platform linux darwin win32
• PATH=/tmp/typeshed-authlib-introspect-venv/bin:$PATH /tmp/typeshed-authlib-introspect-venv/bin/python tests/check_typeshed_structure.py
• PATH=/tmp/typeshed-authlib-introspect-venv/bin:$PATH /tmp/typeshed-authlib-introspect-venv/bin/python -m mypy.stubtest _socket socket --show-traceback --strict-type-check-only --custom-typeshed-dir . --ignore-unused-allowlist --allowlist stdlib/@tests/stubtest_allowlists/common.txt --allowlist stdlib/@tests/stubtest_allowlists/darwin.txt --allowlist stdlib/@tests/stubtest_allowlists/py314.txt --allowlist stdlib/@tests/stubtest_allowlists/darwin-py314.txt
• git diff --check

Screenshots/Logs

• N/A

Closes #15213

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉

[srittau]

Thanks!