chore(examples): add -S to env shebangs for portability

[lucky-verma]

five executable examples use an env shebang without -S:

examples/audio.py
examples/speech_to_text.py
examples/text_to_speech.py
examples/realtime/realtime.py
examples/realtime/push_to_talk_app.py

added push_to_talk_app.py per your review. i checked every mode-100755 file under examples/ and those five are the only ones missing -S. (azure.py, azure_ad.py and module_client.py are 755 with no shebang at all — different issue, left alone.)

also correcting myself: i said linux env splits the args so this only broke on older BSD. that's wrong, it fails there too — on coreutils 9.4 ./examples/audio.py gives env: 'rye run python': No such file or directory.

only shebang lines change. modes unchanged, ruff check + format clean on all five.

[DTiming24]

Good portability cleanup. env -S is a subtle but important change here; a brief note in the examples README about the minimum shell/coreutils support would help users on older environments avoid surprises.

[jbeckwith-oai]

One same-class executable shebang is still missing from this portability sweep: examples/realtime/push_to_talk_app.py:1 remains #!/usr/bin/env uv run (mode 100755). On Linux, the kernel passes uv run as one argument and GNU env tries to find an executable with that literal name, so direct invocation fails with the same error these four edits fix. Please change it to #!/usr/bin/env -S uv run as well. The four modified Rye shebangs, executable modes, Ruff/format checks, and compile validation are otherwise clean.

[lucky-verma]

added -S to push_to_talk_app.py. also corrected the linux claim in the description — you were right, it fails there too. PTAL